Aerial Servant (GEP)

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It's not surprising the creatures from planes other than the Prime sometimes make permanent homes in the Waveless Sea. The aerial servant is a creature originally native to the Elemental Plane of Air that now calls the Deep home (though many aerial servants still also reside upon the Elemental Plane of Air). 'Course, the name "aerial servant" is a name given them by cutters on the Prime who summon them-since aerial servants are only semi-intelligent at best, they don't have a specific race name for themselves. Instead, they flow in almost-mindless happiness through the Misty Shore, feeding upon the currents that stir the ethereal medium.
When viewed on the Ethereal, aerial servants possess a wavering humanoid torso that trails away into sparkling blue vapor; when summoned to a prime world, they remain invisible. Naturally, they don't like being summoned for service and always attack their summoner unless restrained by a spell (protection from evil serves this purpose). (MONSTROUS MANUAL under "Elemental, Air Kin") 
AERIAL SERVANT: AC 3; MV Fl 24 (A); HD 16; THAC0 5; IIAT 1 ; Dmg 8d4 (grapple); SA Grab; SD + 1 or better weapon to hit, invisible; SZ L (8' tall); ML elite (14); Int semi- (2-4); AL N; XP 9,000. 
SA-Grab: Aerial servants have a Strength of 23 and attack by grabbing and strangling opponents, causing 8d4 points of damage with the initial strike and each round thereafter until the victim breaks free. A victim with exceptional Strength receives a percentile chance equal to his exceptional Strength to break free; those with 19 or greater strength automatically break free. Creatures with more hit points than an aerial servant can also break its grasp at will.
SD-Invisible: Prime targets suffer -5 penalties to surprise.