Tomb of Ancients - Tunnels, Trap Room, and "High-Flying" Achievement/Trophy

After using the third lever to open the trapdoor, as shown in the previous section, drop into the tunnel below.

If you knocked the undead knight (4) into the pit, he'll be waiting here. If you want all kills, you can now knock him down twice with bullets or melee attacks. The second time, he won't get up. Or, run along the tunnel to the fork. Head to the left to load a new area.

Immediately turn around and return to the main tunnel. The knight should now be back up above, so you can explore without being attacked. Follow the short passageway, now on the left, to a door.

Kick it open for a lower-body strength upgrade.

Enter and get the V-PACKER SHOTGUN (2) and 2 boxes of shells (3-4).

Exit and head to the right, past the new area load-in.

At the end of the passageway, kick down the next door. (If you try this before getting the upgrade, Lara will tell you she's not strong enough.)

Proceed through the first small room. When the gate closes behind you, look to the right...

...for a lever. This opens the gate at the far end of the room. It's timed to close after about 10 seconds, so you have to hustle to get past the poisoned darts and spikes. If you also want the "High-Flying" achievement/trophy, you'll need to "pass through the trap corridor with one swan dive and no damage taken."

Here's the sequence: Pull the lever.

Turn left to face the traps. Quick-save and start running.

Conveniently, there's a long, horizontal stripe on the floor just before each set of spikes. If you jump just before that stripe, Lara should clear the spikes.

Keep running and jump just before the next stripe on the floor to clear the second set of spikes.

Continue running and just before the next stripe on the floor...

...take a running swan dive (Forward + Walk + Jump) to clear the third set of spikes. Then run on through the gate before it closes.

The achievement/trophy registers as you enter the next room, so don't save again until you're sure you have it. If Lara takes damage, or you miss a jump, reload your quick-save and try again.

NOTE: If you don't care about achievements, just take regular running jumps over the three sets of spikes. Then, when you make it through the timed door, use an antidote or large health pack if Lara has been poisoned; or just run for the exit, and Lara will be healed when the next level loads.

Follow the hallway to the left.

I don't see an inscription on the wall anywhere, but apparently Lara notices something we don't because you get a new notebook entry (35/62): "Ultrices Atrium Custodiunt. The wrathful sentinels guard the hall within." (Again, this page on Von Croy's Notebook lists all entries.) Continue through a series of doors to the next level.

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