i use an sk and a warrior with 2 zerkers and cleric, just keep one tank outta range until first is stunned and with zerkers he dies fast enough with decap
IIRC Vallon's FD comes with a 30 second stun with a 24 second recast. If you stand up you are still stunned and won't be able to reaggro Vallon.
That means he can keep a single tank perma stunned, or two tanks stunned nearly 50% of the fight. Makes for a fun fight to box. I've not gone through Fabled PoTime, but back in the day I would box through PoTime and the easiest way I found to handle him was let my main tank sit out and just take him out with two mages spamming pets and Rage Pets. He can't keep all of them stunned (does he even stun pets? not sure).
Well yeah lol... I have that activated. But there is a 10ish second stun, feels like 60! Anyways, if everyone is FD'd (aggro wipe) plus stun, he regens instantly.