Tesi enters labor, assisted by Metzier, and gives birth to a girl, Amari. She encounters expedition member Yasmin, who in the process of turning into a ghoul had killed the villagers. Tasi activates a teleporter in the ruins to transport herself to the village, but find it deserted and goes into labor. She later rescues another expedition member, Richard, but kills him in a rage when he attempts to leave her to die. To her horror, Tasi discovers that one of her expedition members, Leon, has been turned into a ghoul. Tasi also comes across signs of a previous expedition led by Professor Herbert. A failed plot to end the suffering caused the Gate on their homeworld to destroy itself, wiping out the Gate Builders and spreading the Shadow, a dangerous force that manifests in red tumor-like growths. As she studies the ruins, Tasi learns that the facility was built by an alien race dubbed the Gate Builders, who could traverse worlds and extend their lives thanks to vitae, a substance obtained by torturing humans on a mass scale. She makes her way out but is caught in a cave-in and falls into ancient ruins that belonged to a highly advanced, but now extinct, society. Tasi travels under the fort and encounters mutated ghouls that stalk the tunnels. Metzier, who instructs her to head to a nearby village. Tasi reaches an abandoned French fort and discovers an unknown force has slaughtered its garrison. During this time, she finds her husband Salim's corpse, having died from the crash. Following the trail of her expedition, Tasi realizes that she is pregnant and has come into possession of a Traveler's Amulet, an alien device that allows her to travel to an alien world. After her plane crash-lands in Algeria, she wakes up to discover that her companions are missing, with no recollection of what happened. The game is set in March 1937, and follows Anastasie 'Tasi' Trianon, a French drafter on an expedition in colonial Africa. Instead, it will bring the player a bit forward, allowing the player to skip the monster encounter entirely during the player's second attempt. Unlike the first game, when the player is killed, the game would not reload an earlier save point. The game does not feature any combat system and when Tasi encounters a supernatural creature, she could either run or hide. Solving puzzles, hiding from monsters, and managing light sources can control her fear, preventing such from happening. Grotesque images will also pop up in the screen. Fear would overwhelm Tasi when she walks completely in the dark, causing her to hallucinate and hear whispers in her head. Like the first game, Tasi's fear level would build up gradually. Players also need to solve various puzzles to progress in the game, and read the notes left by non-playable characters to know more about the story. Players can also scavenge matches, which can be used to light up mounted torches and candles. The game is dimly lit, and players must use light sources, such as Tasi's own fuel lamp, to see clearly and find ways to progress. The player assumes control of Tasi Trianon, who must wander through desert caves and ancient tombs in order to find the whereabouts of her companions. Like The Dark Descent, the game is played from a first-person perspective.

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