Near the entrance to the Sunken Chapel is a square tile with Osiris's glyphs. There's also an interesting area with a time bomb above on the right, but you can't get past the bars just yet. For now, jump up to grab the stone crossbeam at the top of the stairs. Pull up.

Then jump from there to the angled beam on the right. Walk down to the bottom....

...and jump across the gap to the next crossbeam, where you'll find a red skull (1/5).

Drop down and continue downstairs into the courtyard with the glowing obelisk. (See the main walkthrough and Combat Challenges page for details.) Climb the scaffolding to find another red skull (2/5).

The next red skull (3/5) is in the floating above the shallow pool off to the right.

Now head up the steps to the northeast.

To obtain the red skull (4/5) in the niche between the tomb entrances, use the Staff of Osiris to raise 2 square platforms in the pool and hop across them to the skull.

In the co-op game, there are no platforms. Instead one character must grapple the golden ring below the niche so another can tightrope walk across to the skull.

NOTE: At this point you may want to take a little detour in order to close the Mark of Set on the ledge above the entrance to the Tomb of Hoarfrost. This will help you get the health and ammo upgrades later. See the main walkthrough for details.

For the final red skull, return to the entrance to the Tomb of the Embalmer.

Follow the cliff wall to the southeast until you're standing on top of an angled, stone wall with water flowing over it.

Jump from there onto the column to the lower left, then to the next column, where you'll find the red skull (5/5). If you've found all five you will now receive the COPPER RING OF PROTECTION (Defense+).

[Return to the Sunken Chapel of Sobek Walkthrough]