[9-20] E3M3: The Tomb of Terror

After ascending the stairs that emerge from the lava, look upwards and to the right. You will spot a large "Q" switch. Shoot this switch to open a teleporter located below. This teleporter will transport you above the lava room, where the red armor awaits.

Following the stairs out of the lava, make a right turn at the four-way intersection. At the end of the short hallway, you will find a room containing a small body of water. Dive into this water to collect 100 health located at the bottom.