I'd say Common Lore (War) and Scholastic Lore (Tactica Imperialis) would be valid skills to roll to clear the ship.  If you can get 10 net successes between Command, Common Lore (War) and Scholastic Lore (Tactica Imperialis) you can kill the demons and fix the ship.  Each successful exorcism contributes five successes, so attacking the demons will probably be necessary.<br/><br/>As for not being able to use your OOC tactical skills...  I simply don't have the energy or attention to run a dungeon crawl right now.  Later in the game, I might allow you to take GM duties when people want to do close in and gritty tactical combat, but I'll generally be reserving it for particularly dramatic moments.<br/><br/>Baromir's special ability does enable him to succeed at skill tests he doesn't have, simply by freak coincidence of knowing the proper information from his extensive background knowledge.