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Calling upon your knowledge of Old Kingdom magic, slowly you clench the fingers of your right hand as you whisper the words of the spell Invisible Fist. Then you jab your fist at the Krorn’s head and the force of your spell materializes with dramatic effect. The creature is spun off its wooden block and slammed face-first against the wall of the tower chamber. With a dull groan it slides down the grimy wall, leaving a trail of bloodied gruel smeared in its wake.
Having incapacitated the tower lookout, you squeeze through the arrow slit and jump down into the chamber.