n medium aberration 

Perception +12; darkvision, scent (imprecise) 30 feet

Languages Aklo (Can't Speak Any Language)

Skills Acrobatics +11, Athletics +10, Stealth +10, Survival +8

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

AC  19; Fort +10, Ref +11, Will +12

HP 40; Resistances physical 3

Attack of Opportunity [R]

Speed 30 feet, climb 20 feet

Melee [>] jaws +12, Damage 1d8+6 piercing

Melee [>] tentacle +11 (agile, finesse), Damage 1d6+6 slashing

Unbalancing Blow Any creature a grick critically hits is flat-footed against its attacks until the end of the grick's next turn.

Vermicular Movement When a grick takes a Stride action to move half its Speed or less, that movement doesn't trigger reactions.

AoE1, page 35.