[Fiend]

***SPOILERS***
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In the inn across from that building you can buy a ring of invisibility. Equip it on someone otherthan your thief and cloak/cast invisibility on them both. run through and make sure that you cant see any one when you take the ring off. give it to your thief cloak him and run back. do the same until all your party members are in the room(also make sure you equipped plenty of summons) and cast 2-3 summons, cloak your thief and send him out exploring. as soon as you see someone, pause tell the summons to attack and tell your thief to move your thief out of sight. You dont really need your entire party in the room, but if you do get spotted it helps if you can cast all your protective spells on one place and stops your wizards from getting slaugtered by a Big Demon.