Bookwurm

Marked for Death. As long as a creature has at least one Poison Mark, it is poisoned and it must make a DC 13 Constitution saving throw each hour, taking 5 (2d4) poison damage on a failed save, or half as much damage on a successful one. Also on a success, the target loses one Poison Mark. A Poison Mark can be removed by the protection from poison spell or similar magic.

A creature with 6 or more Poison Marks falls prone at the end of each of its turns.

Paper Shaper. As a bonus action, the book wurm can fold or unfold its body. While the book wurm is folded and remains motionless, it is indistinguishable from a usual sheet of paper.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 1 piercing damage, and the creature must make a DC 13 Constitution saving throw, taking 5 (2d4) poison damage on a failed save, or half as much damage on a successful one. Also on a failure, the target gains one Poison Mark.