BGG p. 123
Death Burst. When the cinder hulk dies, it leaves behind a cloud of cinders and smoke that fills a 10-square-radius sphere centered on its space. The sphere is heavily obscured. Any creature that moves into the area for the first time on a turn or starts its turn there must succeed on a DC 16 Constitution saving throw or take 10 ( 3d6 ) fire damage. The cloud lasts for 1 minute or until it is dispersed by strong wind.
Multiattack. The cinder hulk makes two Slam attacks.
Slam. Melee Weapon Attack: +8 to hit, reach 1 sq., one target. Hit: 16 ( 2d10+5 ) bludgeoning damage plus 10 ( 3d6 ) fire damage.
Wave of Cinders (Recharge 1d6>=5 ). The cinder hulk emits a wave of smoldering ash from its face, hands, or chest in a 30-square cone. Each creature in that area must make a DC 16 Dexterity saving throw. On a failed save, a creature takes 31 ( 7d8 ) fire damage and has the blinded condition until the end of its next turn. On a successful save, a creature takes half as much damage only.