Choose your roles:
Trash
- Rank Overseer: Use
Ursol's Vortex on 
Wild Wallop casts to prevent the mobs from jumping away. - Lowly Moleherd: Stand in melee range of the mob.
- Wandering Candle: Line of Sight
Quenching Blast as it does high damage. - Torchsnarl: Use
Wild Charge to avoid 
Headlock Charge. Try not to stand in melee range.
Ol' Waxbeard
- Bait the adds on the tracks so that they're killed by the carts.
- You can use
Skull Bash to quickly switch to the cart spawned by 
Underhanded Tracktics - This should generally be a single target boss. Laborers are padding and not necessary to kill. Focus the cart spawned by Underhanded Tracktics
Blazikon
- You can easily light two candles with Wild Charge, three if using
Dash or 
Stampeding Roar. - Save defensive cooldowns for
Dousing Breath.
The Candle King
- You can tank the boss while everyone is standing next to the wall to group up the
Eerie Molds
The Darkness
- You can
Shadowmeld 
Shadowblast.