Thread-Bound Constrictor Snake 2014
CR 3 construct
Huge construct, unaligned
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.
The snake is immune to any spell or effect that would alter its form.
The snake's weapon attacks are magical.
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.
Actions
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 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details