Deliver them from their fates no matter the cost by opening the way to the source and sending voidsents to die there in the long run so that they join the lifestream.
The archfiends were clear about their want to just die in the source and get into the lifestream so again... why not just suicide?
Unless Golbez has another goal which... cure? the current voidsents. Suicide on the source seems to be the only proper way to get into the lifestream and be reborn as a mortal again without ruining the source and... well... having a large population of voidsents in it ready to kill you or even transform you into a voidsent again.