Horus (Original Timeline)

One of the Egyptian gods and enemy of Set.

Horus along with his high priest, Semerkhet, imprisoned the evil god Set at the Valley of the Kings. Semerkhet then presented the Amulet of Horus to his god. Horus accepted it and placed it on Set's sarcophagus. The Amulet's inscriptions were written by Semerkhet and they warned of Set's return. That would be fulfilled when Lara Croft removes it not knowing until she reads the inscriptions afterwards.

The only way to imprison Set again would be to find the Armour of Horus and place it, along with the Amulet, on a statue of him at his temple. Then, Horus would be summoned to once again battle and defeat Set.

After Lara has placed everything on Horus' statue she waits patiently for him to arrive. The summoning is almost complete. Set's swarm of locusts fly into the temple and destroy the statue and the Armour. The Amulet falls into the surrounding water and the light of Horus enters Lara. Set is released and there is only one more possible way to stop him. Lara recovers the Amulet and climbs back up the shaft avoiding Set's fire bolts. Lara finds a trapdoor with a space for the Amulet. She places it and the trapdoor closes, sealing Set away once more. Lara managed to stop Set without Horus' help.

Trivia

 * Horus also appears in Tomb Raider. The Eye of Horus item can be picked up and a giant statue of him alongside fellow god Anubis can be found beneath the sphinx in the Sanctuary of the Scion.