The Curator

Wowwiki link---> http://www.wowwiki.com/The_Curator

Best video link---> https://www.youtube.com/watch?v=sy59cqiuFRc&mode=related&search=

Step 1:
Tank him in the middle of the room.Only one tank needed.
Every 10 seconds he spawns an Astral flare(chain laighting raid for 500-700 dmg).
Melee stay on Astral Flare and try kill them quick.
Caster stay max range, focus the curator and also help kill adds asap.

Step 2:
After cast 10 Flares he use all his mana and start cast "evocation" taking 200% more damage.
Caster dps him, melee finish kill falres and dps him.

Step 3:
He start cast again Flare.
At 15% he goes into Enrage mode,stop summon adds but largely increases his melee DPS .

Remember : Immune arcane damage--- After 12 minutes he goes berserk and will wipe your raid.

Tip from a horde friend.

Put all DPS at the right side and all healing at the left side.

http://www.wowwiki.com/images/3/36/Karazhan_detail_layout.jpg

check this
might help on our way to next bosses