http://img117.imageshack.us/img117/44/11292008050754we8.jpg
exactly 13 minutes and 25 seconds at an average of 1300 dps (1600 with the adds alive) as far as spells used:
Seal of Light > Judgement of Light > Shield of Righteousness > Holy Shield
Rinse and repeat. Keeping Blessing of Sanctuary up to allow for burst dps with the adds proccing it, he dropped to ~50% or thereabouts before they were automatically exploded. From there on in it was a case of mana management: Arcane Torrent and and Divine Plea, keeping Blessing of Sanctuary up. Only had to bubble + bandage twice, once due to my own lack of attention. Used Lay on Hands once, for some HP but mostly for the mana returns.
To me it seems burst DPS during the adds being alive was key to getting him down before i eventually ran OOM. But even then, all it requires is some attention and just refreshing Blessing of Sanctuary
Have fun killing him
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