Step one: Pop the Ix'aern in either the Northeast or the Northwest room because those are the two rooms that have the neat little teleport walls connecting each other.
Step two: Cast Bio II (and Poison II if you're quick) on the Ix'aern.
Step three: Step through the teleporter (this counts as zoning and the DRG will lose hate). Return back through teleporter.
Step four: When you get the message that Bio has worn off, recast it and repeat.
Step five: When his life dips down to like 2-3%, chainspell and Blizzard III him out so that he doesn't die from Bio and you lose the drop.
With manaburn the main thing that you have to keep in mind is that the DRG has shared party hate (like the Darters in Aery). If you try to nuke and zone while in party it will attack other party members, and even if you zone it will still come at you through the teleporter. To fix this, I figured out that you just disband party the second it pops. One person is in charge of keeping Bio on (using the strat above) which keeps him from healing when he goes unclaimed. The BLM simply alternate nuking and zoning one at a time and resting when MP is low. Remember the Ix'aern doesn't aggro so you can sit right next to him. If you don't want the possibility of the Vice (cape) going to one person w/o lotting for it, just have the BLM make a small party and kill it together so it goes into treasure pool.