Use the spell to transfer yourself into one of your minions during a game in the dungeon. Then while in the minion, press [F12] to display the cheat menu. Use the mouse to highlight a cheat.
Alternatively, use the spell to transfer yourself into one of your minions during a game in the dungeon and press [F11]. If you entered the code correctly, the screen will flash. To use a creature's spells, press [Keypad Enter] and select a spell. Additionally, press [Keypad Enter] at the main screen during a game for another cheat menu. Unlimited free creatures can be created by using the "Place Creature Mode" option.