Dungeons and Dragons 5th Edition Monster Manual pg 322
Flying Snake CR: 1/8
Tiny beast,
Armor Class: 14
Hit Points: 5 (2D4)
Speed:
30 ft
, fly: 60 ft
, swim: 30 ft
Senses: Blindsight 10 ft.
Challenge Rating: 1/8
Flyby. The Flying Snake doesn't provoke opportunity attacks when it flies out of an enemy's reach.
Actions
Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 1 Piercing Damage plus 7 (3D4) Poison Damage.
Brightly colored, winged serpents found in the Ten-Thousand Deaths and Tiefling Cabals . The people of both locations have domesticated the Flying Snakes to serve as messengers that deliver scrolls wrapped in their coils.