Shapechanger. The Building Mimic can use its action to polymorph into a structure or back into its true, amorphous form, which is a swarm of individual structure mimics. Its statistics are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.
Adhesive Architecture(Object Form Only). The Building Mimic may adhere to a creature that enters or ends its turn within the Building Mimic's space. The creature is considered to be grappled (escape DC 21). Ability checks made to escape this grapple have disadvantage.
Corrosive Interior. The Building Mimic may deal 14 (4d6) acid damage to any creature that starts its turn within the mimic's space.
False Appearance (Structure Form Only). While the Building Mimic remains motionless, it is indistinguishable from an ordinary structure.
Swarm. The Building Mimic can occupy another creature's space and vice versa. The Building Mimic can't regain hit points or gain temporary hit points.
Legendary Resistance (3/Day). If the Building Mimic fails a saving throw, it can choose to succeed instead.
Multiattack. The Building Mimic makes 5 psuedopod attacks.
Pseudopod. Melee Weapon Attack: +11 to hit, reach 25 ft., one target. Hit: 12 (1d12 + 6) bludgeoning damage. Instead of dealing damage, the Building Mimic can grapple the target (escape DC 21). Ability checks made to escape this grapple have disadvantage.
Engulf. As an action, the Building Mimic can engulf a creature grappled by it, moving the creature to an area within its space.
Attack (Costs 1 Action). The Building Mimic makes 1 pseudopod attack.
Summon Mimic(Costs 2 Actions). The Building Mimic summons 1 additional mimic-type monster with a Challenge Rating of 5 or lower within its own space. The summoned mimic acts on its own initiative count. It disappears after 1 hours, when the Building Mimic dies, or if it is reduced to 0 hit points.
Shift (Costs 2 Actions). The Building Mimic shifts its interior, effectively repositioning its walls, entrance, and edit points.
Description
The Building Mimic is an entity shrouded in mystery and often dismissed as mere urban legend. Contrary to popular belief, which portrays these creatures as singular, monolithic entities, Building Mimics are actually a collective - a swarm of Structure Mimics that have come together to form what appears to be an entire building.
This hive-like aggregation allows them to operate as a pack, sharing a communal desire to feed and grow. Scholars who acknowledge the existence of these creatures remain divided on their origins; some speculate that the first Building Mimics were formed as a defensive response to large predators, such as giants or dragons, forcing individual mimics to band together for survival. This has led to a complex social structure unseen in other mimic species, allowing them to dominate entire urban landscapes as living, predatory constructs.
The notion of a building praying upon its occupants remains a chilling thought for the many, ensuring the Building Mimic's place in the annals of monstrous legends.
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