I refused to do the healing challenge, I wanted to push myself to the limit with the dps one. It took me more then an hour and several wipes, but I managed to do it.
I didn't go for the full nuke tact as Draktharion (cause I had less ilvl then you, Sintia), what worked for me was this set up of glyphs and talents:
1 - Psyfiend: while I know most people advice Void Tendrils here, they didn't work for me. They managed to root one ooze or two (sometimes) and they got killed pretty fast.
2 - Body and Soul: just because I hate ground positioning spells like the feathers. But I think feathers are better for this challenge.
3 - FDCL, no brainer imho.
4 - Bulwark: saved me more times then I'd like to say lol
5 - DI, no brainer imho.
6 - Halo
Glyphs: Inner sanctum, dark binding and mind flay
Flask and food buff + celestial blessing (rep item)
Basically I started by nuking Wrathion and trying to always dps him from behind, rapidly moving away when he summoned the first wave of oozes.
If you dot them all up, you get some nice chain proc of instant spells, and you can managed to bring them down in a decent time. I suggest, though, not to kill all of them at the same time, since they respawn after 1 minute. I found out that it was better having to deal with 2 or 3 reborn oozes at once rather then all of them. For me at least, it could be different for you.
Timing psyfiend and psychic scream is life safer, especially if you need some breath to heal yourself.
Never let dots expire from Wrathion, obviously.
Halo is pretty cool for killing all Wrathion illusions at once, its long cd is a bit meh but with fast mind searing on the illusion groups you can manage to down all of them everytime.
You can always disperse if too many illusions are alive and they are finishing their cast.
One thing to note: illusions are CCable. Happened that they were up with some oozes around, fear saved me.
And that's all, you just have to be patient, kite a lot and not be afraid to go full nuke if wrathion is extremely low on health and the oozing are chasing you
Edited by Molekh on 04/07/2013 16:30 BST