You need to go through the room with the traps to proceed. Since you cured the poisoned imp, you should have the first skeleton doll. When you get to the trapped room, send it ahead of your characters, to trigger the traps. You should have found a skill book that teaches the individual healing spell, which can come in handy to top off your hit points after a fight or trap.
The traps north of where your characters are in the screenshot can be bypassed, or the summoning doll can trip them.
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