As was the case with adrenaline before the adrenaline crystals, building residual souls before a boss fight adds needless tedium to the process of resupplying between boss kills by going out of your way to soul sap 3-5 random mobs in the world, i would like for there to be a way to also charge your residual soul count at war's retreat.
#Residual Souls Charging @ War's Retreat
naive pond
sacred cargo
Thread sap the dummies to the side as your prepping for boss, get the idea but there is kinda of a semi work around that's used now