Lithluran, The Gate Master
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Lithluran spawns 4 adds upon aggro, one in each corner of the four rooms surrounding him.
NW Mob: Spell damage only, doesn't summon
SW Mob: Spell damage only, doesn't summon
NE Mob: Tank this (can melee damage)
SE Mob: Tank this (can melee damage)
Put a tank on the NE, SE, and Boss, and kill all 5 mobs while keeping them all within 10% of each other. Use casters to damage the NW and SW corner mobs (make sure a pet is not attacking them), and adjust how much damage is needed on the other mobs based on that.
If mobs go outside of 10%, an AoE will wipe out the raid.