At the end of Penumbra: Oveture what is the thing that takes you away?

[gandalf91]

Tuurngait is a virus, (whether or not it is ultimately benevolent, malevolent, and to what extent). Viruses spread through replication. It cannot fulfill that which viruses do without a series of hosts. All the enemies in BP were once human, if it should have killed you, why shouldn't they have died as well?