Firebrand is on the left and Stormcaller is on the right. They cannot be repositioned at all as they are stationary. Like other boss fights, they needed to be killed fairly simultaneously.
Split the group up into two groups. A tank for each . . well . . tank, a healer and two dps. Group make ups can vary. Some folks go all melee for Stormcaller, but we actually do a ranged and melee on that tank.
When the fight starts, all ops members fight on top of the tanks. One lucky member gets to be down on the ground. This mechanic will be described shortly. Some groups use a healer, however we use a ranged DPS as we found it better suited to our needs.
Once the start fights, red circles appear on the ground. Standing in them is bad as rockets will fall to these areas and cause lots of damage. Being on the tanks avoids this. The ops member on the ground will have to avoid these best they can.
Ops tanks should position the turrets away from the other members on top of the tanks as both do frontal AoEs. Generally, the ops tank for Firebrand stands on the outside (or left) of the tanks. I think the other tank is positioned at 6 - 7 o'clock on Stormcalller.
Ops tank for Firebrand needs to avoid getting the incenerate armor debuff. Although it's possible to heal through the damage, it's fairly spikey and hard to do. Ideally someone else on the team should take the threat, have the debuff placed on them, and then have the ops tank taunt it back. Some groups try and move the ops tanks around to switch targets, but it gets really messy. If someone can taunt the turrent off the ops tank then that is best. In our group, we have a sage perform a rescue on the ops tank which drops his threat. Once the turret performs the debuff on another ops member, the ops tanks re-engages the turret. Note: Incinerate armor only happens once per 'tank' phase. It generally comes after Stormcaller does its double destruction ability.
Ops tank for Stormcaller needs to be aware of when double desctruction is being cast. When it occurs, the tank moves the turret over to where the dps is standing, and makes sure the ops members on the tank are in front of him/her. This way, the double destruction debuff goes onto them instead of the ops tank. Once this is done, the ops tank moves back to their original tanking position. Double destruction generally occurs twice in this phase. Only after the first double destruction does Firebrand do it's incinerate armor debuff.
All the while this is going on, the ops member forced to remain on the ground is doing a couple of things. 1. Not standing in red circles to avoid rocket damage. 2. Avoiding the lightening rockets that fall. They tick for large amounts of damage if you are caught in them. 3. Yellow circles will appear under their feet. These need to be dispelled. Otherwise the player will get hit with a large amount of damage. Also, this member needs to stay out of the Stormcaller frontal AoE range. As if that wasn't enough, this person needs to heal or dps. Again, we use a dps for this as they can even out the damage if need be, and in our case, is easier for them to do damage while running around.
After the tanks get to a certain percentage (see below) a new phase will occur. In this phase mobs will appear under a shield. Each group will need too move off the tanks and under the shields. DPS the mobs down while AVOIDING the shield generator. It only has 5900 health and it takes damage every time rockets hit it. Any kind of damage to it will cause the shield to disappear early and the falling rockets will cause lots of damage. At the end of this phase, the ops members will need to get back oon top of the tanks and repeat the first phase. Note: During this phase, Stormcaller's ops tank will be the one running around outside of the shield. Much like the first volunteered member. When the mobs are down, and phase 1 occurs again, the original ground member takes over. Also of note: The mobs will appear in one of three places. 1. Front of tanks 2. To the left of Firebrand or the right of Stormcaller 3. Behind the tanks. There is no real warning of where they will appear, you need to wait for them to show.
IMPORTANT
Transitioning between Phase 1 and Phase 2 is done through percentage of health on the tanks. The first transition hits when both tanks are at 80% or lower (every other transition is in 20% decrements). So transitions can be controlled. This is important because unless your dps can really pump out damage, Stormcaller will do double damage twice in the phase (it's time based vs. phase transition which is % health based). If the tank does double damage at the 80% mark, the transition will happen around the same time and it's game over. In our cases, a lightning AoE would always drop on the ops members for Stormcaller.
