Aggressive. As a bonus action, Atlas can move up to its speed toward a hostile creature it can see.
Berserk. Whenever Atlas starts its turn with 125 hit points or fewer, roll a d6. On a 6, Atlas goes berserk. On each of its turns while berserk, Atlas attacks the nearest creature it can see. If no creature is near enough to move to and attack, Atlas attacks an object, with preference for an object smaller than itself. Once Atlas goes berserk, it continues to do so until it is destroyed or regains all its hit points.
Atlas's creator, if within 60 feet of the berserk Atlas, can try to calm it by speaking firmly and persuasively. The Atlas must be able to hear its creator, who must take an action to make a DC 15 Charisma (Persuasion) check. If the check succeeds, the Atlas ceases being berserk. If it takes damage while still at 170 hit points or fewer, Atlas might go berserk again.
Immutable Form. Atlas is immune to any spell or effect that would alter its form.
Keen Senses. Atlas has advantage on wisdom (Perception) checks that rely on smell or sight.
Necrotic Absorption. Whenever Atlas is subjected to necrotic damage, he takes no damage and instead regains a number of hit points equal to the necrotic damage dealt. Alternatively, if his Necrotic Torrent ability isn't charged, he can choose to have that recharge instead of regaining hit points.
Magic Resistance. Atlas has advantage on saving throws against spells and other magical effects.
Magic Weapons. Atlas's weapon attacks are magical.
Regeneration. Atlas regains 20 hit points at the start of his turn. If atlas takes acid damage, he regains only 10 hit points at the start of his next turn. Atlas only dies if he is hit by an attack that deals 20 or more acid or fire damage while he has 0 hit points.
Multiattack. Atlas makes five slam attacks.
Slam. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 13 (2d12 + 7) bludgeoning damage.
Necrotic Torrent (Recharge 5-6). Atlas unleashes a torrent of necrotic energy in a 30-foot cone. Each creature in that area must make a DC 18 Constitution saving throw, taking 56 (16d6) necrotic damage on a failed save, or half as much on a successful one. Creatures reduced to 0 hit points by this damage dies.
Unbridled Fury. In response to being hit by a melee attack, Atlas can make one melee weapon attack with advantage against the attacker
Description
A flesh golem is a grisly assortment of humanoid body parts stitched and bolted together into a muscled brute imbued with formidable strength. Powerful enchantments protect it, deflecting spells and all but the most potent weapons.