Giant Poisonous Snake

AC 14 - HP 11 - 30 ft., swim 30 ft.
STR +0, DEX +4, CON +1
Bite. +6 to hit, reach 10 ft./ 1d4 + 4 piercing
damage, and the target must make a DC 11
Constitution saving throw, taking 3d6
poison damage on a failed save, or half as
much damage on a successful one.