PFSRD:Improving Creatures

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Monster Advancement

The following rules allow you to adjust monsters, increasing (or even decreasing) their statistics and abilities while still creating a balanced and fun encounter.

Templates

A template is a set of rules that you apply to a monster to transform it into a different monster. All templates give precise directions on how to change a monster's statistics to transform it into the new monster.

Acquired Templates: Some templates, like the lich, are the results of a creature's choice and desire to transform. Others, like the ghost template, are the result of an external force acting upon a creature (for example, when a tormented person dies and becomes a ghost). Yet in both cases, the template changed a creature well after its birth or creation—these types are called “acquired templates,” and can be added to a creature at any time during its existance.

Inherited Templates: Some templates, such as the half-dragon and half-fiend templates, are part of a creature from the beginning of its existence. Creatures are born or created with these templates already in place, and have never known life without them. These types of templates are called “inherited templates.”

Simple Templates

Simple templates can be applied during the game with minimal effort. This makes it easy, for example, to deal with celestial and fiendish creatures conjured in the heat of battle by summon monster spells. All simple templates have two categories of changes. The “quick rules” present a fast way to modify die rolls made in play to simulate the template's effects without actually rebuilding the stat block—this method works great for summoned creatures. The “rebuild rules” list the exact changes you make to the base stat block if you have the time to completely rebuild it—this method works best when you have time during game preparation to build full stat blocks. The two methods result in creatures of similar, if not identical, abilities. In some cases, a complete rebuild does unusual things to a creature. For example, the advanced creature template gives and animal too much Intelligence, and a young incorporeal creature is tougher than a normal one.

Advanced Creature (CR +1)

Creatures with the advanced template are fiercer and more powerful than their ordinary cousins.

Quick Rules: +2 on all rolls (including damage rolls) and special ability DCs; +4 to AC and CMD; +2 hp/HD.

Rebuild Rules: AC increase natural armor by +2; Ability Scores +4 to all ability scores (except Int scores of 2 or less).

Celestial Creature (CR +0 or +1)

Celestial creatures dwell in the higher planes, but can be summoned using spells such as summon monster and planar ally. A celestial creature's CR increases by +1 only if the base creature has 5 or more HD. A celestial creature's quick and rebuild rules are the same.

Rebuild Rules: Senses gains darkvision 60 ft.; Defensive Abilities gains DR and energy resistance as noted on the table; SR gains SR equal to new CR +5; Special Attacks smite evil 1/day as a swift action (adds Cha bonus to attack rolls and damage bonus equal to HD against evil foes; smite persists until target is dead or the celestial creature rests).


Celestial Creature Defenses
Hit Dice Resist Cold, Acid, and Electricity DR
1–4 5
5–10 10 5/evil
11+ 15 10/evil

Entropic Creature (CR +0 or +1)

Creatures with the entropic template live in planes where chaos is paramount. They can be summoned using spells such as summon monster and planar ally. An entropic creature's CR increases by +1 only if the base creature has 5 or more HD. An entropic creature's quick and rebuild rules are the same.

Rebuild Rules: Senses gains darkvision 60 ft.; Defensive Abilities gains DR and energy resistance as noted on the table; SR gains SR equal to new CR +5; Special Attacks smite law 1/day as a swift action (adds Cha bonus to attack rolls and damage bonus equal to HD against lawful foes; smite persists until the target is dead or the entropic creature rests).


Entropic Creature Defenses
Hit Dice Resist Acid and Fire DR
1–4 5
5–10 10 5/lawful
11+ 15 10/lawful

Fiendish Creature (CR +0 or +1)

Creatures with the fiendish template live in the Lower Planes, such as the Abyss and Hell, but can be summoned using spells such as summon monster and planar ally. A fiendish creature's CR increases by +1 only if the base creature has 5 or more HD. A fiendish creature's quick and rebuild rules are the same.

Rebuild Rules: Senses gains darkvision 60 ft.; Defensive Abilities gains DR and energy resistance as noted on the table; SR gains SR equal to new CR +5; Special Attacks smite good 1/day as a swift action (adds Cha bonus to attack rolls and damage bonus equal to HD against good foes; smite persists until target is dead or the fiendish creature rests).


Fiendish Creature Defenses
Hit Dice Resist Cold and Fire DR
1–4 5
5–10 10 5/good
11+ 15 10/good

Giant Creature (+1)

Creatures with the giant template are larger and stronger than their normal-sized kin. This template cannot be applied to creatures that are Colossal.

Quick Rules: +2 to all rolls based on Str or Con, +2 hp/HD, –1 penalty on all rolls based on Dex.

Rebuild Rules: Size increase by one category; AC increase natural armor by +3; Attacks increase dice rolled by 1 step; Ability Scores +4 size bonus to Str and Con, –2 Dex.

Resolute Creature (CR +0 or +1)

Creatures with the resolute template live in planes where law is paramount. They can be summoned using spells such as summon monster and planar ally. A resolute creature's CR increases by +1 only if the base creature has 5 or more HD. A resolute creature's quick and rebuild rules are the same.

Rebuild Rules: Senses gains darkvision 60 ft.; Defensive Abilities gains DR and energy resistance as noted on the table; SR gains SR equal to new CR +5; Special Attacks smite chaos 1/day as a swift action (adds Cha bonus to attack rolls and damage bonus equal to HD against chaotic foes; smite persists until target is dead or the resolute creature rests).

Resolute Creature Defenses
Hit Dice Resist Acid, Cold and Fire DR
1–4 5
5–10 10 5/chaotic
11+ 15 10/chaotic

Young Creature (CR –1)

Creatures with the young template are immature specimens of the base creature. You can also use this simple template to easily create a smaller variant of a monster. This template cannot be applied to creatures that increase in power through aging or feeding (such as dragons or barghests) or creatures that are Fine-sized.

Quick Rules: +2 to all Dex-based rolls, –2 to all other rolls, –2 hp/HD.

Rebuild Rules: Size decrease by one category; AC reduce natural armor by –2 (minimum +0); Attacks decrease damage dice by 1 step; Ability Scores –4 Strength, –4 Con, +4 size bonus to Dex.

Adding Racial Hit Dice

Adding racial Hit Dice to a monster is a similar process to building a monster from scratch. As additional Hit Dice are added, other abilities increase in power as well. Additional Hit Dice usually results in better attack bonuses, saves, hit points, and skills, as well as more feats. It can also include additional spellcasting capability and other powers.

Step 1: Plan the Monster

When advancing a monster by adding racial HD, you should start by deciding what you want the monster to become. In most cases, this means merely a tougher, stronger version of an existing monster. Note the desired CR of the new monster. This is also the point at which you should decide whether the creature is going to increase in size. As a general rule, creatures whose Hit Dice increase by 50% or more should also increase in size, but GMs should feel free to ignore this rule if warranted by the individual creature or situation.


Table: Monster Advancement
Higher CR Lower CR Hit Point Change AC Change Attack Bonus Change Damage Change
1 Less than 1 5 1 1 2–3
2 1 5 2 2 2–3
3 2 10 1 1–2 2–3
4 3 10 2 2 2–3
5 4 15 1 1–2 3–4
6 5 15 1 1–2 3–5
7 6 15 1 1–2 4–5
8 7 15 1 1–2 4–5
9 8 15 2 1–2 4–5
10 9 15 1 1 3–5
11 10 15 1 1 4–5
12 11 15 2 1–2 4–5
13 12 20 1 1 4–5
14 13 20 1 1 3–5
15 14 20 1 1 4–5
16 15 20 1 1–2 8–10
17 16 30 1 1 7–10
18 17 30 1 1 8–10
19 18 30 1 1 7–10
20 19 40 2 1 8–10
21+ 20+ 40 2 1 8–10

Step 2: Add Hit Dice

Next, determine how many Hit Points the base monster receives per Hit Die (see Table: Average Die Results for average results based on the die type). Using Table: Monster Advancement, add up all of the values in the Hit Point Change column for each increase using the Higher CR column. For example, if the base monster was CR 3 and the new monster is set to be CR 5, the total would be 25 hit points. Next, add additional Hit Dice to the monster to increase its hit points by the desired amount. Note that if the creature increases in size, its Constitution may also increase, as noted on Table: Size Changes, granting it additional hit points that might offset the need for additional Hit Dice (this also applies to any other Constitution increases). These values are not absolute. Some monsters have fewer hit points than normal for a creature of their CR and rely on a higher AC or other defenses. Some creatures are primarily spellcasters and typically have fewer Hit Dice. When advancing your monster in this way, be sure to take these factors into account and adjust your monster accordingly.


Table: Size Changes
Old Size* New Size Str Dex Con Natural Armor
Fine Diminutive Same –2 Same Same
Diminutive Tiny +2 –2 Same Same
Tiny Small +4 –2 Same Same
Small Medium +4 –2 +2 Same
Medium Large +8 –2 +4 +2
Large Huge +8 –2 +4 +3
Huge Gargantuan +8 Same +4 +4
Gargantuan Colossal +8 Same +4 +5
* Repeat the adjustment if the creature moves up more than one size.


Table: Size Bonuses and Penalties
Size AC/Attack CMB/CMD Fly Skill Stealth Skill
Fine +8 –8 +8 +16
Diminutive +4 –4 +6 +12
Tiny +2 –2 +4 +8
Small +1 –1 +2 +4
Medium +0 +0 +0 +0
Large –1 +1 –2 –4
Huge –2 +2 –4 –8
Gargantuan –4 +4 –6 –12
Colossal –8 +8 –8 –16

Step 3: Ability Scores

Once you have determined the number of additional Hit Dice possessed by the creature, use this number to modify its other statistics. Start with ability scores. For every 4 additional Hit Dice gained by the monster, add 1 to one of its ability scores. In addition, make any modifications to its ability scores based on an increase in size, as noted on Table: Size Changes.

Step 4: Skills and Feats

When adding skills, check to see if the creature's Int modifier changed. If it is unchanged, simply multiply the total number of ranks per Hit Dice gained by a monster of its type times the total number of added Hit Dice and add that number of ranks to its existing skills. If its Intelligence modifier has increased, perform the same calculation as if it had not increased and then multiply the change in its Intelligence modifier times its new total number of Hit Dice and add that number of additional ranks as well (adding new skills as needed to spend all of the ranks). If the creature changed size, make sure to adjust its Fly skill and Stealth skill bonuses (if any) as noted on Table: Size Bonuses and Penalties. Next, give the creature additional feats. Creatures gain one feat at 1 Hit Die and one additional feat for every 2 Hit Dice above 1. Most additional feats should be focused on increasing the creature's combat abilities, but metamagic feats and skill feats are also possible choices depending on the creature's role.

Step 5: Statistics

Next, adjust the creature's derived statistics, such as its initiative, AC, saving throws, melee and ranged attack bonuses, BAB, CMB, and CMD. Adjust any special attacks or qualities that are based on the creature's size, Hit Dice, or ability scores. If the creature changed in size, be sure to adjust its AC, attack, CMB, and CMD accordingly (as noted on Table: Size Bonuses and Penalties). Table: Monster Advancement also tracks the average change to the creature's AC, attack rolls, and damage rolls. Add up these values for each step of change between the creature's original and new CR. If the creature changed size, make sure to make changes to its natural armor bonus, as noted on Table: Size Changes. If the creature does not meet these averages, you should consider adjusting its ability scores or Hit Dice to get it closer to the target.

Step 6: Comparison

Finally, compare the new monster's statistics to those presented on Table: Monster Statistics by CR for a creature of its adjusted CR. Note that if the original creature deviated from these values, the new one should do so in a similar fashion. For example, if the original creature had higher than normal hit points but a lower than normal CR, the creature should maintain that balance at a higher CR (even though its hit points and AC both increased).

Adding Class Levels

Of all the methods of advancing a monster, adding class levels requires the most adjudication and careful comparison. Some classes truly add to the power and abilities of some monster types, while others do not. For example, adding levels of barbarian to a hill giant can be a great addition, whereas adding levels of sorcerer is less useful. When adding class levels to a creature, take the following three steps.

Step 1: Determine Creature's Role

When adding class levels to a creature, the first step is to determine what role the base creature fulfills. There are three basic roles into which a creature might fall. A creature can fall into more than one role if its abilities are diverse.

Combat: This creature is designed to be good at melee or ranged combat with a weapon or its natural weapons. In either case, these monsters have a number of feats and abilities to enhance their combat prowess (or are good simply by nature of their Hit Dice and ability scores). If a creature does not possess many spells, special abilities, or skills, it is a combat monster. Most animals, constructs, dragons, humanoids, magical beasts, monstrous humanoids, plants, and vermin fall into this role, as do some creatures of all the other types.

Spell: Spell creatures possess a large number of spells that allow them to attack or harass their enemies. These creatures usually have lower hit points and relatively weak attacks as compared to the averages for creatures of their CR. Note that creatures that only possess spell-like abilities do not fall into this role, and are usually considered combat or special. Most dragons and outsiders fall into this role, but any creature that has a list of spells prepared or spells known likely falls under this heading as well.

Skill: Creatures of this type rely on skills (usually Stealth) to ambush or take down their prey. This also includes creatures who take advantage of the environment or spells, such as fog or invisibility. Some aberrations, fey, magical beasts, monstrous humanoids, and outsiders fall into this role.

Special: Creatures that do not fall into any of the other categories usually rely on special abilities and powers to attack their foes. They might be tough or dangerous in physical combat, but the threat is greatly increased by their special abilities. A list of monster roles for determining key classes appears in Appendix 13.

Table: Monsters with Class Levels
Monster Role Barbarian, Fighter, Ranger Cleric, Druid, Sorcerer, Wizard Bard, Rogue Monk, Paladin
Combat Key
Spell Key*
Skill Key Key
Special
* This class is only key if its spellcasting levels stack with those possessed by the creature.

Step 2: Add Class Levels

Once you have determined the creature's role, it's time to add class levels. The first step of this process is to modify the creature's ability scores. Creatures with class levels receive +4, +4, +2, +2, +0, and –2 adjustments to their ability scores, assigned in a manner that enhances their class abilities. Creatures with NPC class levels do not receive adjustments to their ability scores. Next, add the class levels to the monster, making all of the necessary additions to its HD, hit points, BAB, CMB, CMD, feats, skills, spells, and class features. If the creature possesses class features (such as spellcasting or sneak attack) for the class that is being added, these abilities stack. This functions just like adding class levels to a character without racial Hit Dice. A monster with class levels always possesses treasure equal to an NPC of a level equal to the monster's final CR (as calculated in Step 3, below). To determine the value of this gear, use the value listed for a heroic NPC of that level, as listed in Table: NPC Gear. Once a total GP value is determined, follow the rules for outfitting an NPC as outlined in that section. Gear should help a monster with class levels remain challenging and retain statistics close to those presented on Table 1-1: Monster Statistics by CR.

Step 3: Determine CR

Determining the final CR for a creature with class levels requires careful consideration. While adding a class level to a monster that stacks with its existing abilities and role generally adds 1 to its CR for each level taken, adding classes that do not stack is more complicated. Table: Monsters with Class Levels gives general guidelines regarding which core classes add directly to a monster's abilities based on its role. Classes that are marked “key” generally add 1 to a creature's CR for each level added. Classes marked with a “—” increase a creature's CR by 1 for every 2 class levels added until the number of levels added are equal to (or exceed) the creature's original CR, at which point they are treated as “key” levels (adding 1 to the creature's CR for each level added). Creatures that fall into multiple roles treat a class as key if either of its roles treat the class as key. Note that levels in NPC classes are never considered key.


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