Unknown Entity

The Force Monster (also called the Wraith creature or the Unknown Entity) is a creature featured in Tomb Raider Legend.

It was linked to an artifact called the Wraith Stone, able to summon it and, in some cases, fuse with its user into a more powerful version of itself. It was originally in a tomb in Paraiso, Peru, and later found and controlled by Amanda Evert.

Tomb Raider: Legend
During an expedition in Peru, the creature was awoken by a team of archeologists, including a young Lara Croft and Amanda Evert. The dig started off playfully enough, with Amanda teasing Lara about falling behind. However the screams of their companions of the creature caused them to cease their playful excursion, just before witnessing the creature slaughter some of their friends.

Lara and Amanda managed to escape the massacre as the site collapsed. Trapped in a large room, Amanda spied the Wraith Stone. With no other alternatives, Amanda pried the stone from the wall, hoping it could help. The creature then vanished, but the removal of the stone caused the room begin to flood, and a cave-in to occur. With Amanda's foot trapped underneath falling rocks, and water quickly rising, Lara was forced to leave, only after witnessing her friend's apparent death from said rocks.

However, Amanda survived, thanks to the help of the creature, which obeyed her as a result of her taking the Wraith Stone. From that day, Amanda could summon and even merge with Force Monster at will, simply by wielding the stone which she wore as an amulet necklace. Using the creature for her own selfish endeavors, she trained it to attack anyone who opposed her.

This was seen during Lara´s expedition to Ghana, where Amanda infilitrated Croft Manor to look for the Ghalali key. Using the Wraith monster, she subdued Zip and Alister, and stole a pair of their headspeakers to be able to talk to Lara.

Amanda summoned the creature again to retrieve the shard of Excalibur from a facility in Kazakhstan, warning Lara to stay out of it's way. Lara was able to fend it off with the help of a giant electromagnetic Tesla cannon, and retrieve the shard. Afterwards Amanda called the creature back and escaped.

Amanda returned to the Dais in Bolivia to await Lara, knowing she would have the reforged Excalibur, which would act as a key to activate the Dais. Lara however wouldn't part with the sword and slaughtered Rutland and his men. Enraged, Amanda merged with the beast, in order to kill Lara. However Lara was able to finally defeat the beast with the help of Excalibur. Lara then took the wraith stone from Amanda and locked it inside her vault.

Abilities
The Unknwon Entity appeared to evolve as it aged, growing larger in size and gaining the ability to fly, as apposed to running around on it’s arm like appendages. It seemed to gain the ability to shoot projectiles of harmful energy as well. When under Amanda’s control, she was able to use The Wraith Stone to heal its wounds. In Kazakhstan, if Lara shoots the Force Monster with a giant electromagnetic Tesla cannon, its health bar is almost out, causing Amanda to feel enraged and regenerate it´s health. Later in Bolivia, when fused with the Wraith creature, Amanda was able to regain it health several times after being hit with Excalibur.

Appearance
The force Monster resembles a demonic creature with no legs, two large arms with long claws, and a skull like head with sharp teeth and yellow, glowing, featureless eyes. It also has a number of long dark tendrils protruding from its back, and is clouded in what resembles black smoke.

Trivia

 * It is currently unknown if the Force Monster survived the encounter in Bolivia at the end of Tomb Raider:Legend. The fact that it does not appear in Tomb Raider: Underworld may suggest so, however it´s true fate it´s not known.
 * Some fans especulated that the Wraith Monster may be some form of the King Tihocan of Atlantis. They both share similar patterns across their torso and back, the creature´s tendrils looking similar to the king´s back blades. This theory is further supported by the fact that Tihocan´s tomb was found empty in Tomb Raider: Anniversary.