Choose your roles:
Guardian
Feral
Resto
BalanceTrash
- Use
Incapacitating Roar, 
Solar Beamand/or 
Typhoonto minimize the amount of 
Arcing Voidand 
Void Infectioncasts during 
Seismic Wave - Make sure that people hit by Void Infectionare either dispelled or topped before Seismic Wave
- Use
Barkskinon Void Bound Despoiler's 
Void Outburst - If Void Bound Despoileris pulled with other casters make sure that spells like
Piercing Walland Void Infectionare interrupted during Void Outburst - Consider using
Ursol's Vortexon Aspiring Forgehandto help the tank drop stacks of 
Fracture
E.D.N.A.
- Use Barkskinon every 2nd set of spikes.
- Dispel
Seismic Reverberationfrom the tank right before 
Seismic Smash. - Every 2nd set of spikes will overlap with
Earth Shatter. Try leaving some spikes up to shorten the length of the dot preceeding the AoE.
Skarmorak
- Use Barkskinon
Void Discharge - You should be fine with picking just a couple of orbs.
- Consider DPSing during Void Dischargeif you can destroy the shield quickly enough.
Master Machinists Brokk and Dorlita
- Use Barkskinwhen
Exhaust Ventsoverlaps with 
Blazing Crescendo - At higher key levels use
Bear Formto survive Blazing Crescendo - The fight has generally a low healing requirement so you can DPS a lot.
- Make sure to top people after the 1st and 3rd Exhaust Ventsso they don't die to Blazing Crescendo
Void Speaker Eirich
- Use Barksinif you're unable to clear
Void Corruptionimmediately. - If the boss is tanked near a wall you can outrange Void Corruption.
- Consider being the first to clear Void Corruptionso you can focus more on healing others.
- Use
Ironbarkon people hit by Void Corruptionthat can't clear it quickly.