There is a shrine that will enslave a subordinate if you cose to send the subordinate to the shrine. Its the ugly that looks like a bunch of mismatched parts
Ho, interesting, I didn’t come across this one so fare but nonetheless that way it don’t seem break to point of the Writ Of Exemption since then it’s by the doing of a divinity.
We could think that it erase the Writ Of Exemption and all legal implication it was bound to from reality for the subordinate.
shrines (sanctuary) are in found when doing dungeons, they are indicated with a i symbole. As for the offering, as ambergrain mentioned, you just have to ask your subordinate to go to the shrine.