5e SRD:Flying Snake
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Tiny beast, unaligned
Flyby. The snake doesn't provoke opportunity attacks when it flies out of an enemy's reach.
Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 1 piercing damage plus 7 (3d4) poison damage.
A flying snake is a brightly colored, winged serpent found in remote jungles. Tribespeople and cultists sometimes domesticate flying snakes to serve as messengers that deliver scrolls wrapped in their coils.