Huge Construct, unaligned
Armor Class 12
Hit Points 60 (8d12+8)
Speed walk +30
Challenge 3
Damage Resistances bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities poison
Condition Immunities charmed, exhaustion, frightened, paralyzed, petrified, poisoned
Senses blindsight 10 ft., darkvision 60 ft., passive Perception 10
Languages understands the languages of its creator but can't speak
Antimagic Susceptibility. The snake is incapacitated while in the area of an antimagic field. If targeted by dispel magic, the snake must succeed on a Constitution saving throw against the caster's spell save DC or return to the textile to which it is bound for 1 minute.
Immutable Form. The snake is immune to any spell or effect that would alter its form.
Magic Weapons. The snake's weapon attacks are magical.
Shifting Form. The snake can enter a hostile creature's space and stop there. It can move through a space as narrow as 1 inch wide without squeezing.
Constrict. Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 13 (2d8 + 4) bludgeoning damage and the creature is grappled (escape DC 16). Until this grapple ends, the creature is restrained, and the snake can't constrict another target.
Source: Creature Codex · OGL/Open