Lvl 1 :

Derv : Gating
Ranger : Soloing keyboss with a 3pop

Lvl 2 :

Derv : Spiking first group, spiking cemetary and soloing keyboss with a 3pop
Ranger : Off dmg on both spikes, pop a stone for breaking aggro at cemetary entrance, gating

Lvl 3 :

Derv : Lighting braziers, spiking keyboss, at fendi pulling 1rst spawn on fire then pulling to bridge braziers
Ranger : Offdmg at keyboss, helping to kill 1rst fendi spawn on the fire spot, spiking next spawns from bridge