I read this excellent campaign, and I had a question about the BIND SOUL spell which a NPC uses in a part of the campaign :
with the description from the PH, I don't understand clearly how the NPC can switch body.
Does it require 2 uses of the spell (1 for the victim, 1 for the spellcaster to abandon his own body and possess the victim's one) ?
If yes, doesn't that spell give a sorcerer immortality vs aging ? That seems overpowered.
Thanks for your help.