Two PLD/NIN with proper back up can hold this mob forever.
As said earlier this mob can be nasty. AOE drain and drain spike are a pain, along with his pets he summons and astral flow and blood weapon. The ONLY enfeeble that will land is Frost.
Recommended Setup for Tank PT:
PLD/NIN
PLD/NIN
WHM
RDM
THF or SAM/THF
Another RDM/WHM or BRD/COR
PLDs can tank backwards to avoid Doom attack.
Best strategy is to pull him to the zone and fight there. Pulling is extremely easy. His spawn area is covered in chigs but once u get it out of there he easily kited. He will lose hate over water so avoid stepping in water when pulling.
Best thing to do is have PLDs hold him below main alliance and have dd sub thf and trick attack onto the PLDS. If they dont have DD then have them zone after WS. Rangers work extremely well on this guy.
He can and will use AOE charm, AOE drain, Dread Spikes, and AOE doom. He also summons 3 pets every minute or so. Pets only stick around to WS and then leave. Pets can target other PT members nearby to WS. He will use Astral Flow at some point and summon 8-9 pets for a TP move rape fest. He will also sue Blood Weapon at some point.
This fight can go from smooth sailing to oh **** in a few seconds. It is recommended to keep focus even at low health as it tends to be the worst below 10%. I would also recommend some kind of 3rd backup tank, capable of holding it for a few minutes incase PLDs get charmed or killed.