For this achievement you need to kill 4 bosses in The Oculus, explanations below.
Drakos the Interrogato
- Drakos summons small orbs which explode, try to avoid them as best you can.
- Drakos will pull your party to him and summon a lot of orbs. You need to run once pulled in, to avoid major damage.
Varos Cloudstrider
- The tank needs to tank him in the center, being aware of the little lasers and no standing in them. These small lasers do not do damage but indicate where your party should not be standing, if you're standing in them then the second set of lasers will hurt you bad.
- Ranged DPS stay near the tank, if you're too far away you will die.
Mage-Lord Urom
- At the very beginning of the fight he will summons 3 mobs, down them. Between each wave eat and drink up.
- When he teleports to the center, everyone run behind a pillar to avoid the AoE damage.
- He casts bombs every 8 seconds, the first bomb the tank should eat. Then run out of his frost field. Once he reaches the edge, start tanking him again. Melee needs to move out of the bomb and keep repeating until he is dead.
Ley-Guardian Eregos
- Awesome mounted fight, your tank should pick up the ruby drake, dps picks up the amber drake, and healer grabs the emerald drake.
- Overall an easy fight, the tanks eye beam ability should take care of all the whelps. DPS should rotate time stop, reducing damage especially when he enrages.
- There will be a point in the fight where Eregos will summon pink floating orbs, avoid these by kiting them around.
- Buff the drakes before jumping on them for some extra stats.