Fragile Terrain (PSR Supplement)

**PSR** is an alternate ruleset that is compatible with most 5e content.
System Differences The Basics PB: Proficiency Bonus Advantage & Disadvantage Reroll Bonus Dice Ability Check Group Check Contest Passive Check Save Ability DC Ability Scores Strength Dexterity Constitution Intelligence Wisdom Charisma Skills	Encounters Group Turns Round-Table Turns Staggered Turns Your Turn Move Action Bonus Action Reaction Making an Attack Unarmed Strike Sunder Cover Communication Hit Points & Damage Hit Points Hit Dice Temporary Hit Points Massive Damage Damage Types Damage Resistance Max Damage	Time Phases Rest Break: a short rest Camp: a rough long rest Downtime: a cozy long rest Downtime Trading Downtime Activity Environment Common Hazards Extreme Climates Peculiar Traits Resistance Immunity Vulnerability Special Senses Defeat Dramatic Death Conditions	Items Carry Capacity Goods & Currency Optional: Material Goods Consumables Weapons Improvised Weapons Attire & Shields Tools Gear Attunement Objects Damaging Objects Hauling Objects Vehicles Optional: Artillery NPCs Attitude Mount Cohort Stat Blocks

Fragile terrain is a common hazard. It includes crumbling floors or thin ice that can only support a creature’s weight momentarily.

If a creature uses any action on fragile terrain, or ends its turn there, the terrain crumbles away and the creature falls through, destroying a 5-foot square of the terrain directly underneath it. A creature can finish its action just before the floor gives away.
A Large or larger creature instead falls through fragile terrain as soon as it enters the space, and destroys a proportionally larger square: 10 feet for Large, 15 feet for Huge, and so on.
A Tiny creature instead doesn't fall through at all.
Any damage to a 5-foot square of fragile terrain, except psychic damage, destroys the square. Fragile terrain has 5 AC.