Bookwyrm

Innate Spellcasting A bookwyrm's innate spellcasting ability is wisdom (spell save DC10). It can innately cast the following spells, requiring no components:

at will: illusory script

Word Walker. The bookwyrm can expend 5 ft of movement to vanish into an adjacent book or scroll. Whilst in the book or scroll, an ink image of the bookwyrm appears on the surface. The snake can expend another 5ft of movement to appear within 5ft of the paper. If the paper is damaged, the bookwyrm is destroyed.

Fragile. If the bookwyrm gets wet, it is destroyed and must be resummoned.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 1 piercing damage, and the target must make a DC 10 Constitution saving throw, taking 5 (2d4) poison damage on a failed save, or half as much damage on a successful one.