Some more thoughts on this critter...
Feats: Dodge, Mobility, Improved Initiative, Spring Attack
Skill Ranks: Bluff 12, Diplomacy 12, Gather Information 12, Hide 12, Intimidate 12, Listen 6, Move Silently 12, Sense Motive 12, Spot 6, Tumble 12 (108 total ranks). I was also considering Knowledge (the planes) and Disguise. What do you think?
Skills: Gacholoths have a +4 racial bonus on Bluff, Diplomacy, and Intimidate checks. They have a +8 racial bonus on Climb checks and can always choose to take 10 on a Climb check, even if rushed or threatened.
Shock: This sounds alot like frighful presence. Here's an attempt at the entry.
Frightful Presence (Ex): When a gacholoth attacks an opponent for the first time, the foe must attempt a DC X Will save. On a failure, a creature with 4 or fewer HD becomes panicked for 1d6 rounds, and one with 5 or more HD becomes shaken for 1d6 rounds. A successful save leaves that opponent immune to that gacholoth's frightful presence for 24 hours. Yugoloths ignore the frightful presence of a gacholoth. The save DC is Charisma-based.
Acid (Ex): A gacholoth's claws secrete acid at all times. This acid deals 1d6 points of extra acid damage whenever it hits with a claw attack and when grappling, during each round when it maintains a hold
And borrowed from our living web...
Wallcrawling (Ex): The gacholoth need not make Climb checks to traverse a vertical or horizontal surface (even upside down). It retains its Dexterity bonus to Armor Class while climbing and opponents get no special bonus to their attacks against it.
Thoughts?