Haltham said it's expensive thralling. I bet it takes a few talented spellcasters to put this sort of enchantment in place. I'm sure the runes to renew it have to be a secondary spell.

[He's never had such an interest in the intricacies of magic before, but attempting to learn thralling has made him long for books to study, or that he'd asked Veronica more questions about it back home]

..I'm just glad there is life here. It's been tiring, surrounded by undead.