You step through the portal.

As you step through the portal, there is a flash of red light, and a sensation of falling...

When you open your eyes, you find yourself in another cavern. The portal has closed behind you. You appear to be alone. High walls of grey stone rise up into the darkness. The cavern is lit by a large glowing crystal formation in the centre, pulsing softly with a white light. Four passageways lead off this cavern. Above three of the passageways are Roman numerals: I, II, and III. The fourth is unmarked.

The crystal formation suddenly pulses a deep red colour, and you feel a burning desire to rip off your clothes and start masturbating. No! you think. You need to complete the Three Trials and get out of here!