Cxaxukluth, spawn of Azathoth
http://www.sendspace.com/file/58q5mc
Text:
<name> is worshipped by those who dwell near him on Yuggoth. Mi-Go are <b>Endless</b>. Additionally, for each gate to Yuggoth that is open, increase the toughness of all monsters by 1 and the toughness of Cultists by 2.
Reality Cannibal: When a Gate Trophy is spent, add a Doom Token to the track.
Start of Battle: Any investigators with Gate Trophies are Devoured.
Attack: X is equal to three times the number of investigators (Not counting those who are Devoured).
Each investigator must pass a <b>Will (+2) check</b> or be Devoured. This check's modifier decreases by 1 each turn.
(Defenses are -X with Magical Immunity)
He fluctuates between relatively easy and extremely difficult, mostly based on the gates to Yuggoth. His ability makes spending gates for clues a risky transaction, but a track of 14 gives you a lot of wiggle room (I might drop it 13 or 12, what do you think?).