How many groups do you think can handle that fight? Been a while since I have done it but remember it being a nasty one.
3 groups sounds about right. Someone'll probably ackshually that it can be done with 2, but I'd bring 3. Can chain-spawn it (clearly) so if a couple clerics are almost done you can go do their other fights (Girplan) and then double/triple up on Zordaks. Less running all the way through TD is a good thing.
I always thought of this guy as being the big boss of epic 2.0 mobs, but Herrian Warfrost (ranger 2.0 mob in WOS) is tougher by a mile. He's been the toughest epic fight, I think.
I'm pretty much done farming DON crystals so here's my secret to getting tons of them. Not much of a secret anymore though, I think everybody knows about this mission now. Faceless folk have had this video for weeks as well.
All you really need is an /open hotkey and to know where the eggs are. Leave the first one up, and once you hit 12 bolt for the exit (two of them are on the way to it)*
Someone running Selo outside helps a lot, as does FD once the train gets too severe. If I hadn't gotten a cleric mob with the boss, it would have taken 3:xx instead of 4:xx, and it can probably be done in 2:xx
* - FD classes don't even need to zone out, just open the first egg and then Imitate Death / other aggro clear on the last one running toward the zoneout and fight the Matriarch there.