How to kill Dark Colluseast: Null and Steelation: Null (TT 3-1)?

Can anyone tell me How to kill Dark Colluseast: Null and Steelation: Null (TT 3-1)?
:handsdown:
After patch 121 or mermaid update, the boss, Dark Colluseast: Null and Steelation: Null, has a random aggro, area stun, and area banish.

:confused:

3-4 DD and cleric all be ok