Spawn the Glutton by killing all the orcs in The Glutton's Bliss messhall, then speak to a deathfist toiler ( -8, 1, -15 ) /waypoint -7.57, 1.00, -14.54. Let the toiler go free, and the sneaky orc will go and ring the gong nearby, spawning the Glutton.
Make sure all the doors possible are shut, as the Glutton will try and rush to The Glutton's Bliss, and if he gets there, he will become unkillable.
Basically a tank and spank, but you will want to stun, slow, and root as much ass possible.
At about 20%, the Glutton runs to the first spot ( ?, 0, ? ) and takes 25% less damage
At 60%, the Glutton runs to the door ( ?, 0, ? ) and takes 50% less damage.
At 40%, the Glutton charges to the far wall and takes 75% less damage.