Nexus (Heroic)

Grand Magus Telestra Hp:242,658

First have your tank go into her room and pull her then try to pull as much damage as possible during the first phase. She will cast fire bombs but your healers should be able to heal through it.
One thing you want to be cautious about its when she uses gravity well that will fling people around the room so you want to have instant damage attacks and instant heals to heal your party members.
At about 50% Hp she will split into 3 aspects: Fire,frost,and arcane. You should polymorph the arcane one to avoid Critter and time stop.Critter is like a polymorph for that aspect and turns you into a critter.Time stop holds you in place and doesn't allow you to do any actions.
If you can't polymorph the arcane aspect because you don't have a mage just try to Aoe the 3 aspects down as fast as possible. After all aspects are dead the boss will come back and you will resume fighting the boss. She may go back to the 3 aspects once more but after that she should be dead.

Commander Stoutbeard or Commander Kolurg Hp:337,025

Once you pull the boss you want to pull him to the cleared part of the hallway so that his Frightening shout doesn't fear you into frozen adds.The Commander will charge a random party member so healers need to ready to heal party members to.
You should kill the adds first that pull with him and then start attacking him. He has a good amount of health and doesn't down really fast so don't be surprised if it takes a while to kill him.

Anomalus Hp:431,392

Anomalus is a really easy boss you just need to be ready for when he summons a chaotic rift. When he summons a chaotic rift you want to switch to it and kill it because until it is dead he will be immune to all damage.You may have to switch back and forth a few times but after that he should be dead.

Ormorok the tree-shaper Hp:431,392

Ormorok's most dangerous ability is crystal spikes so when you see the ice peeking through the ground you want to make sure your not above it or you will take a large amount of damage when it pops up.He will also cast spell reflect so casters need to watch out for when he does that or they Will take a lot of damage. These are his main abilities so other than these just Dps the boss tell he's dead.

Keristraza Hp:512,278

For this fight click the orbs for each boss you killed qand then it will start the fight. All dps want to stay on the bosses sides NOT behind the boss because the boss will do tail swipe and it will do a big chunk of damage to you and Knock you back.
You want to move around or jump (recomened) because if you don't move you will start getting stacks of intence cold on you which will do a lot of damage to larger the stack and is almost impossible for a healer to heal through it.

I hope this guide will help you kill the bosses of Nexus.