Full Nirvana Guide

Most of what is written here in are that of my own findings through numerous deaths and runs. This was first posted and edited on Calamitys forums a few times before being brought here. Left my edit notes from the other forum at the bottom.

I wont include squad formations, because honestly any squad can go. There are two bms that used to be in my faction that soloed it together no cleric, due to interval and constant spark state. For normal people all you need is a cleric, a tank, and a dd. 4 people squads are very popular, just finding someone to just open is hard.

First off I am gonna break the instance down by areas.

1st Area: Infernal Lair ~ 100% Inferno Sovereign
2nd Area: Noxious Den ~ 100% Noxious Sovereign
3rd Area: Vampires Domain ~ 100% Vampiric Sovereign
4th Area: Demonic Niche ~ 40% Demonic Dictator, 40% Demonic Tyrant, 20% Demonic Sovereign(2x drop boss)
5th Area: Ashura's Hollow ~ 40% Ashuras Dictator, 40% Ashuras Tyrant, 20% Ashuras Sovereign(2x drop boss)
6th Area: Heaven's Coliseum ~ 40% Goldwing Phoenix, 40% Arbiter of Flame, 20% Nether Queen(2x drop boss)
7th Area: (Opposite side of 6th Area) 100% Vanished Ancestor

1st Area: Infernal Lair

Boss: Inferno Sovereign
Special Boss Info: This boss does a Mana Drain. When you first attack the boss it does a ranged mp drain, and a circle of tombstones appear, kill all the tombstones then the boss. The room also spawns circles that explode and do 5k dmg per explode and they spawn in multiples. Some groups can catch the boss in the hallway which glitches the circles, but more often then not this just resets the boss and you gotta start over with the gargoyles. This boss does a load of exp, hypers can be used here, though at 100 who would really want too I dunno.
Area:Noxious Den

Boss: Noxious Sovereign
Special Boss Info: Does a small AoE poison to Melee that is laughable. The boss will say some red text and will buff himself, this is laughable too, though having a veno is nice I have ran without and nothing ever happens.
Area:Vampires Domain

Boss: Vampiric Sovereign
Special Boss Info: This boss does a Severe AoE mana drain. After the first hit the boss will spawn 6 foxes, 3 on each side of her. They will continue to spawn if they are not all killed at the same time. Heavy AoE dmg works wonders with a good pull. Has a 15 minute timer, if boss isnt killed within then you get a "You will regret this..." And everyone dies instantly
Area: Demonic Niche
Spawns one of three available bosses with a 33% chance of getting a boss that does a double drop.

Boss: Demonic Dictator
Special Boss Info: This boss is normal except he spawns two adds, one white one black. You must kill which is a one shot for anyone with a weapon the black spawn. If you kill the white one a 5k AoE dmg will in compass the whole room. At the last 25% of hp the boss will break BB and start casting AoE dmg, just do chromatic healing.
This picture also depicts the white and black feathers:
Boss:Demonic Tyrant
Special Boss Info: This boss is like the Super hacking slash boss in FC, except for his Circle for the AoE dmg is much greater. His speech starts with, "Let the ground quake.." With that started its best to run back and forth in the room rather then scatter in a giant circle.
Boss:Demonic Sovereign (33% chance, Has a 2x boss drop)
Special Boss Info: Normal boss, just tank and kill adds that spawn.
Area:Ashura's Hollow

Boss: Ashura Dictator
Special Boss Info: This boss is easy, but he spawns 3 little snakes that you must ignore. If said baby snakes die they each do 5k AoE dmg to the whole room. The baby snakes cast a poison to the character it touches, a swift purify is needed.
Boss: Ashuras Tyrant
Special Boss Info: The boss is uneventfull, but the ceiling will drop rocks randomly on the party as well as spawn red circles that explode but do little to no dmg.
Boss: Ashuras Sovereign
Special Boss Info: Refered to as the Beserker boss, will randomly debuff a player and slash them doing alot of dmg, kills most people. When boss red text appears run around and try not to get hit. Triple spark will save you if your not lagging. His random debuff is a fast attack, his beserker attack is slowed so you have plenty of time to get out of the way unless your the tank since your right under him.
Last Area: Heaven's Coliseum

Boss: Goldwing Phoenix
Special Boss Info: This boss will grow at 180k hp left into a giant chocobo looking chicken. Boss 2nd Evolution: Giant Chicken
Special Boss Info: This boss will spawn small embers of fire on people, these little fires do 2.5k dmg every other second in 10ish meter circle. The tank will most likely have to move the boss around depending on where the fire spawns occur to keep his dd help out of danger. The fires will continue to burn for 3 minutes before extinguishing.
Boss:Arbiter of Flame
Special Boss Info: Contrary to his name, he spawns no fire but is merely just in the fire room. He does though a massive AoE dmg that must be BBed or party will all die. The Bm/Barb are best for this running since they have a greater normal speed.
Boss: Nether Queen (Dubbed the Trixy boss by Calamity after one of its longest standing Marshals for its red fiery eyes and hands of fury, and has the 2x drop rate)
Special Boss Info: This Boss looks easy but really isnt. The mysterious old man will spawn randomly around the room when she says "Feel a taste of my anger" You will have 10 seconds[seems more like 6] to run to the old man or she will kill you with a 200k'ish attack. Tranq orbs work well for tanking thru it.
The other side of Heaven's Coliseum is the Vanished Ancestor
Special Boss Info: This boss most squads have problems with, there are 5 mob spawns that occur while you attack the boss, and 5 chest spawns that occur at the same time. now each chest prevents a certain mob spawn from attacking and one shoting the group. The "runner" as most groups call it must have holy path, you only get 20 seconds from spawn before it goes boom.
To use a chest drop dig the chest harvest the item run to mob, left click mob, right click the item from inventory that you just dug to prevent the mob from attacking.

See chart:




Guide is in producing stage, if any information is incorrect please let me know what is correct so I can fix it. I am working on the missing information please bare with me.
*Edited April 15, corrected some info, and added missing information provided by Destini and Esco
*Edited April 20- Added some missing boss screenshots, edited the boss spawn %'s I believe this is more accurate
*Edited May 2- Added in screenshot for trixyboss
*Edited May 7- corrected some spelling