Giant Poisonous Snake

AC 14 HP 18 Speed 30', swim 30'
STR 10(+0) DEX 18(+4) CON 13(+1)
INT 2(-4) WIS 10(+0) CHA 3(-4)
Skills Perception +2, Stealth +6, Survival +2
Senses Blindsight 10' Passive Perception 12
{1}{e}Bite +6, 10' reach, 1 target, 1d4+4 piercing,
make a DC 11 Con save, taking 3d6 poison on a
fail, half as much damage on a success.