The MAX HEALTH UPGRADE and MAX AMMO UPGRADE are in the area with the time bomb and flame vents, near where you first entered this part of the Overworld. However, to get them, first you'll need to open the bars there.

Start by moving to the entrance of the Tomb of the Embalmer. (It's the one on the upper left.)

Stand on the tile with Osiris's glyphs, just to the left of the doorway...

...and use the Staff to raise a column beneath you. Jump onto the stone crossbeam to the lower left.

Move to the right end of the beam and jump from there to the round column to the lower left, then to the next stone crossbeam on the right.

Again, walk to the end of the beam and jump to the next round column, then the next.

You should now be above and facing the entrance to the Tomb of Hoarfrost. Use the Staff to close the Mark of Set on the ledge above the door.

This opens the bars back in the area with the time bomb.

NOTE: At this point, to save backtracking, you should go after the final red skull as described in the main walkthrough. After that, you can explore the area you just opened.

[Part 2 | Return to the Sunken Chapel of Sobek Walkthrough]