n small cold elemental water 

Perception +7; darkvision

Skills Athletics +7, Stealth +7

Str +1 Dex +3 Con +2 Int -4 Wis +1 Cha +0

AC  18; Fort +8, Ref +9, Will +5

HP 35; Immunities bleed, cold, poison, paralyzed, sleep

Speed 25 feet, climb 20 feet

Melee [>] jaws +9 (finesse), Damage 1d6+1 piercing plus 1d6 persistent cold

Icicle [>] (concentrate) Until the next time it acts, the icicle snake appears to be an unassuming icicle. It has an automatic result of 27 on Deception checks and DCs to pass as an icicle.

Bestiary 2, page 114. Expanded in LOIL.