Cimex Carnosus

Aversion to Fire. If the golem takes Fire damage, it has Disadvantage on attack rolls and ability checks until the end of its next turn.

Cold Aura. At the end of each of Cimex Carnosus’s turns, each creature in a 5-foot Emanation originating from Cimex Carnosus takes 16 (3d10) Cold damage.

Berserk. Whenever the golem starts its turn Bloodied, roll 1d6. On a 6, the golem goes berserk. On each of its turns while berserk, the golem attacks the nearest creature it can see. If no creature is near enough to move to and attack, the golem attacks an object. Once the golem goes berserk, it remains so until it is destroyed or it is no longer Bloodied.

The golem’s creator, if within 60 feet of the berserk golem, can try to calm it by taking an action to make a DC 15 Charisma (Persuasion) check; the golem must be able to hear its creator. If this check succeeds, the golem ceases being berserk until the start of its next turn, at which point it resumes rolling for the Berserk trait again if it is still Bloodied.

Immutable Form. The golem can’t shape-shift.

Lightning Absorption. Whenever the golem is subjected to Lightning damage, it regains a number of Hit Points equal to the Lightning damage dealt.

Magic Resistance. The golem has Advantage on saving throws against spells and other magical effects.

Bite. Melee Attack Roll: +11, reach 10 ft. Hit: 18 (2d10 + 7) Piercing damage plus 14 (4d6) Cold damage. If the target is a Medium or smaller creature, it has the Grappled condition (escape DC 17), and it has the Restrained condition until the grapple ends.

Slam. Melee Attack Roll: +7, reach 5 ft. Hit: 13 (2d8 + 4) Bludgeoning damage plus 4 (1d8) Lightning damage.

Swallow. Strength Saving Throw: DC 19, one Medium or smaller creature Grappled by Cimex Carnosus (it can have One creature swallowed at a time). Failure: The target is swallowed by Cimex Carnosus, and the Grappled condition ends. A swallowed creature has the Blinded and Restrained conditions, it has Total Cover against attacks and other effects outside Cimex Carnosus, and it takes 10 (3d6) Acid damage plus 10 (3d6) Fire damage at the start of each of Cimex Carnosus’s turns.

If Cimex Carnosus takes 30 damage or more on a single turn from a creature inside it, Cimex Carnosus must succeed on a DC 15 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, each of which falls in a space within 5 feet of Cimex Carnosus and has the Prone condition. If Cimex Carnosus dies, any swallowed creature no longer has the Restrained condition and can escape from the corpse by using 15 feet of movement, exiting Prone.