Chi-Yu (5e Creature)
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Tiny construct, neutral evil
Beads of Ruin. Chi-Yu emits an aura of ruin in a 30-foot radius around its beads. Creatures inside this aura that aren't Chi-Yu have a -5 penalty to any saving throws they make. The remove curse spell, or similar magic can be used to suppress this effect for 10 minutes.
Cursed Rejuvenation. When Chi-Yu is reduced to 0 hit points, the fire that makes up its body disperses, leaving its beads behind. These beads are magical and cannot be destroyed under normal circumstances. Chi-Yu comes back to life with all its hit points in 1d10 days, unless a dispel magic, remove curse or similar magic is cast at 7th level on the beads.
Lava Fish. Chi-Yu can burrow through solid stone in addition to normal earth at its normal burrowing speed, leaving a 10-foot radius tunnel of magical molten lava in its wake. Any creature standing in this area takes 22 (4d10) fire damage at the start of each of their turns. Lava is considered difficult terrain to any creature that isn't immune to fire damage or doesn't possess a swim speed. The lava cools into igneous rock after 1 hour of time.
Multiattack. Chi-Yu uses nasty plot, then uses dark pulse two times or lava plume once.
Nasty Plot. Chi-Yu makes a DC 20 Intelligence check. On a success, any damage dealt its actions increases by 10 until the end of Chi-Yu's turn.
Lava Plume. Chi-Yu blasts a massive plume of lava into the air, which crashes down on a point within 30 feet of Chi-Yu in a 60-foot tall, 20-foot radius cylinder. Each creature in that area must make a DC 17 Dexterity saving throw, taking 39 (6d12) fire damage on a failed save, or half as much damage on a successful one.
Overheat. Chi-Yu unleashes an immense blast of fire at a creature it can see within 30 feet of itself. The targeted creature must make a DC 17 Dexterity saving throw. On a failed save, the creature takes 78 (12d12) fire damage and is thrown 10 feet away from Chi-Yu from the force of impact. On a successful save, the creature takes half as much damage and isn't thrown. After Chi-Yu makes this attack it is weakened. The DC for saving throws they cause decreases by 3 for the next minute, to a minimum of 5.
Dark Pulse. Chi-Yu strikes a creature with dark, twisted energy. They must make a DC DC 17 Wisdom saving throw. On a fail, they take 17 (5d6) psychic damage, and have to roll a d100, being incapacitated during their next turn on a roll of 20 or lower. A creature who's Dexterity score is equal to Chi-Yu's that rolls a 20 or lower may roll a d4. On evens they are not incapacitated on their next turn. A creature who's Dexterity score is higher than Chi-Yu's cannot be incapacitated by dark pulse. A creature that succeeds doesn't take any damage, and has no chance of being incapacitated by it.
The can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The regains spent legendary actions at the start of its turn.
Curse. Chi-Yu casts bestow curse on a creature within 30 feet of itself. This version of the spell does not require concentration and ends if a creature is 30 feet or further from Chi-Yu.
Chi-Yu resembles a fish made of fire, with two beads in place of eyes. This construct was formed from the envy of countless people over the years, which formed itself a body made of fire.