Giant Poisonous Snake
Medium Beast, unaligned
Armor Class 14
Hit Points 11 (2d8+2)
Speed swim +30, walk +30
Challenge 1/4
STR
10
+0
DEX
18
+4
CON
13
+1
INT
2
-4
WIS
10
+0
CHA
3
-4
Skills perception +2
Senses blindsight 10 ft., passive Perception 12
Actions
Bite. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 6 (1d4 + 4) piercing damage, and the target must make a DC 11 Constitution saving throw, taking 10 (3d6) poison damage on a failed save, or half as much damage on a successful one.
Source: 5e Core Rules · OGL/Open