MT should take the PLD.
OT should take the DRG and tank him SE to drop ice away from middle.
All DD should be on WHM.

The order to kill ads: WHM > DRG > PLD

1) Burn down WHM (look alway from cast if needed).
2) Always be behind DRG.
3) Don't dps PLD until his shield falls.
4) Let the targeted person go melee range to PLD and get zombified.

Congratulations you have passed the ads phase.