Perception +7; low-light vision, scent (imprecise) 30 feet
Skills Acrobatics +9, Athletics +8, Stealth +8, Survival +6
Str +2, Dex +4, Con +3, Int –4, Wis +1, Cha –2
AC 19; Fort +7, Ref +10, Will +7
HP 27
Coiled Opportunity As Attack of Opportunity, but the serpent can use this reaction only if it’s coiled.
Speed 20 feet, climb 20 feet, swim 20 feet
Melee fangs +11 (finesse), Damage 1d8+2 piercing plus 1d4 electricity
Coil The serpent uses an action to coil itself; increasing its reach with its fangs from 5 feet to 10 feet. After the serpent strikes with its fangs, it becomes uncoiled.
Lightning Rattle The serpent rattles its strange metal tail and unleashes a bolt of lightning in a 60-foot line. The bolt deals 2d10 electricity damage (DC 17 basic Reflex save). Once the giant lightning serpent uses this ability, it must wait 1d4 rounds before doing so again.