The following question itself is a spoiler, as will any answers given. You've been warned!
Is the barbarian now the only class who can rescue Shadowheart from the Nautiloid without using the parasite? Even passing two separate arcana checks, the wizard/other casters are simply given the opportunity to just bypass the need for getting the key. There's no actual advantage since even using the rune requires a parasite wisdom roll to open the door. The barbarian can just pass a DC 10 strength check to pop it open, though. I'd like to be able to free her without using the parasite at all.