A spell the party recovered from Chakhem's reward 'maps', which are actually spellbook pages; the GM noted 'one of those spells is Rune Trap' [S54 00:26:14]. Venris consolidated the scattered spell pages (including this one) into a single book item, so it is learnable without destroying the page [S54 00:39:45].
Most recently recorded in S54.
No open hook is currently recorded.
No open hooks are currently recorded.