Showdown at the Crystal Core

Quest giver: Ulgin Darkhammer
Requirements: The Crystal Bloom
Request Phrase: assistance
Entry Phrase: ready

The first priority in the raid is to clear the crystal trash around the lake. It isn't difficult, but since the event is timed you'll want it all dead before you start the clock. Once all the trash is cleared move the raid to Kaigrun Darkhammer, when around 90% of the raid is in range he will give an emote and the event begins. 35 seconds after the Tyranont will emote:

My minions, arise and remove the dwarves from our realm

And a wave of crystal mobs will spawn at the center and start walking towards the dwarves. If they reach them they will begin to fight and any dwarf death results in a raid failure. The wave contains 1-3 sets of 4 crystal creatures, each set has one sphere (Nexiont). When the Nexiont is killed the other 3 creatures in its set are reduced to 0% health. All mobs can be mezzed.

50 seconds after the first wave the Tyrnont will emote again and another wave of 1-3 sets spawn. The waves keep spawning, getting longer between waves until about 4 minutes between at wave 9. If you take too long the time between waves starts getting shorter, and by wave 20 they are spawning every 5 seconds.

The goal is to get to the tyranont at the center. Once agro it begins casting a host of AEs and single target debuffs which increase damage taken, reduce healing, reduce damage, etc. However, they all illusion you when they land so if everybody is mounted they just bounce off. Your best bet is to set up right outside the central area and kill until you reach wave 9 (when the delay is 4 minutes), then charge and burn the boss down. When it dies all adds despawn and the chest appears.

Normal mode chest contains 2 runes, 2 Primeval Essences, and 2 of the following:

Hard mode chest contains 2 runes, 1 Primeval Essence, and a random back slot: