[9-27] E4M3: The Elder God Shrine

From the room with Scrags above a pool of water and a lift, take the lift to the higher level. The Scrags emerged from rooms behind stained glass; walk through the stained glass to find items.

Proceed through the door leading to the blue-walled maze. Hug the right wall until you discover a gold star button on the wall. Pressing this button will lower you into a secret room.

Within this secret room, directly beneath the lift that leads to the second button, is a portal. This portal grants access to the red armor that was visible from the Scrag room mentioned in step 1.