Head up the stairs to the left of the Pharaoh's tomb.
Go down the stairs beyond the HEALTH SHRINE.
Climb onto the low ledge ahead. Just before the next snowmaking machine, head to the left.
In the single-player game there's a grapple ring here, which you can use to climb down over the edge and retrieve a red skull (4/5). In the co-op game there is no ring, so one player needs to grapple another and lower him or her down to the skull.
From here, head up the stairs to the left of the snowmaking machine to reach the entrance to the Tomb of the Architect.
The door is sealed, so you'll need to find a way in. First, move onto the tile with Osiris's Glyphs near the AMMO CACHE to the left of the doorway.
Use the staff to extend a column so you can reach the last red skull (5/5). In co-op you can either use an Egyptian character's bubble shield to boost another character onto the ledge or climb up the round steam vents to reach it. If you've found the other skulls as well, you will now receive the BRONZE RING OF STRENGTH (Weapon Damage+, Bomb Radius+).
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