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Opening of the Dark Portal Achievement

Achievement Info

Objective: Defeat Aeonus.

strategies

There is a long encounter in the Black Morass leading up to Aeonus. For the achievement you only need to kill Aeonus. If you need a strategy for killing the portals all the way up to Aeonus you should go to WoWWiki.com.

Aeonus Strategy

All mana related characters should try drinking up before engaging Aeonus, his portal does not spawn adds.
The party should avoid being in front of Aeonus, he does a Sand Breath, frontal AoE.
Healers should keep HoTs rolling on the tank at all times. This will help during Time Stop, this is an AoE stun that will hit everyone in the party.
The rest of the fight is trivial and with practice is very easy.