If the Fig Tree Has no Fruit

Kill the Old Tribe and burn the corpses

Truly, there is nothing more disgusting than violation of divine laws. This darkness that has settled in that forest is able to return Sparks to dead bodies. Blasphemy!
However, this sorceress of yours, Eurial, suggested something that will interrupt their unholy existence: fire!
Burn their bodies, and then the Darkness will not be able to bring them back to life.
You also need to kill their leaders who were the first to turn to the Darkness. By breaking their will to resist, we will finally put an end to this rebellion.

Are they permanently dead?

It looks like this rebellion has come to an end. The strength of the Old Tribe is broken. Reed will stay with me, you will proceed alone.