Task statement:
Tirranun has proven himself to be a deadly adversary. He shows no discretion, remorse, or reason for the wholesale slaughter for which he is responsible. Many innocents that crossed his path here in Lavastorm lie dead because of his irrational rage. Take a force into the Delve and smother his flames once and for all. The beast must not be allowed to wreak havoc on our people any longer.

Reward: 5 crystals and 3 of the following:
Scorched Green Metal Visor
Russet Rockscale Armguards
Hands of Flame
Blackened Sandals
Glimmering Fire Opal Band
Brimstone Spaulders
Smoldering Claw of Tirranun
Ashen Blade of the Slayer

Tirranun is a fire dragon that lives within the Delve. When you enter the mission you first cross a bridge to reach Tirranun. As you cross the bridge you will randomly get emotes "The platform shudders violently, causing you to nearly lose your footing.". On each emote you will be knocked upwards and lev effects dispelled. Make sure you stay centered on the bridge to avoid a lava bath.

When you reach the far end you will see Tirranun in his first form. In this form he can proc a banish on the main tank. You'll need a mage or two in the main group for Call of the Hero for when this happens. Also in this form Tirranun casts Tirranun's Incinerating Aura, an AE for 2250 dd and 750 damage per tick. The AE goes off once per minute. Don't plan on resisting as its a -475 fire check. Beat Tirranun down to 0%.

Upon reaching 0%, two things happen. First, he collapses into " Tirranun`s ashen form". Second it sets off an AE, Expulsion of Flame. This AE strips 7 buffs and steals 2500 mana/endurance. It also happens to cure the Aura AE, just in case its still on you. While he is in ashen form, you can not harm him, and he slowly regenrates (approx 1% per tick). Meanwhile adds begin to spawn, slowly at first (1 per minute) and picking up speed as Tirranun heals (up to about 1 per 15 seconds). The adds are mezzable, though at this point it is better to kill them. They also proc Blinding Ash, a 12 second blind. Keep killing adds as they pop until Tirranun reaches 90%.

At this point, Tirranun wakes up and quickly regens the last 10% before assuming his final form. You have 4 things to watch for now. First, he continues to banish the tank to the lava, so keep mages going for Call. Second, the adds continue to spawn. Mez them now and focus on Tirranun (they despawn on his death). Third, he casts an AE Breath of Tirranun. This AE is a bit weaker, only 1500dd and 500 per tick. Its also a bit easier to resist with a -375 fire check. He recasts this AE every 30 seconds. Fourth, there is a new emote, something about geysers, which launches Scalding Steam, 2k dd with a small knock up component. It is also possible Tirranun is buffed with Form of Lava, a buff that gives a 3k dd defensive proc. It may be wise to dispell him at start to try and remove this.

When killed, all adds despawn and a chest appears with loot. This mission has a 5 day lockout