Interesting strategy posted on Evilgamer.net regarding way to beat ToR and avoid some of the mana drain issues. The strategy from there is cut and pasted below.
Ours is as follows.
Trigger event.
Beat on boss
Offtank / mez the 4 blues till 3 the mini named spawn,
Kill the blues - Kill adds as they spawn
Beat the 3 mini named to under 5% and then kill 2 of them Leave arch mage up and off tanked while rest of raid meds back to full.
Kill arch mage and then beat boss down to 28%
During this phase keep the blues mezed / off tanked but kill the evoker/vicar mobs till you have 8 scout/myrmidon mobs.
Once he is at 28% ish (not below 26%) then beat all 8 blues to 10% health.
Now the fun starts.
Mini burn the Boss to 5% HP lock should be very quick.
Knights deflection tank the horde of adds.
Full burn on the Reds defiler and advisors first.
AoE from Zerkers and Rogues to kill blues
All adds down then finish the boss when his HP unlock.
The issue I have with this, is that the Red Con adds, like the Advisor are just melee for 30 seconds. After they've been alive for 30 sec, then they cast the viral HP/Mana drain, and it's a brutal drain - I don't think we can survive getting more than once or twice (incurable, lasts for 1 minute (10 ticks) and drains 10k hp/m/e a tick).
If we can split the dps (this is a BIG if, when you look at Oruatyrim's parse of DHs 2, none of the casters except me and Bdaillya were on the DPS list for the adds - am sure they are killing Bayle, which is OK, but if they disregard targets in Tower, we're never gonna win) accurately, and power Kyle Bayle down 5% in the time it takes to kill the 2 red con adds, we can do this very easy. The trick is staying alive and in good condition mana-wise to this level, so that you can do normal burns when we need too - I know, easier said than done, but it should be our goal.