Large Construct, Unaligned
Traits
Immutable Form. The golem can't shape-shift.
Magic Resistance. The golem has Advantage on saving throws against spells and other magical effects.
Fire Absorption. Whenever the golem is subjected to Fire damage, it regains a number of Hit Points equal to the Fire damage dealt.
Actions
Multiattack. The golem makes two attacks, using Bladed Arm or Fiery Bolt in any combination.
Bladed Arm. Melee Attack Roll: +12, reach 10 ft. Hit: 20 (3d8 + 7) Slashing damage plus 10 (3d6) Fire damage.
Fiery Bolt. Ranged Attack Roll: +10, range 120 ft. Hit: 36 (8d8) Fire damage.
Poison Breath (Recharge 6). Constitution Saving Throw: DC 18, each creature in a 60-foot Cone. Failure: 55 (10d10) Poison damage. Success: Half damage.
Found on p.181 of MM2025 (Free Rules)