Eitr

Eitr is the fluid of life in the Nordic mythology. The Thralls are born from this fluid. It has a bright blue color, and is very found in Helheim. Lara shoot Amelia until she fall in a void full of Eitr, and later Amanda uses her powers to throw the doppelganger in it. After shuting Jörmungandr Mechanism down, Lara throws Thor's Hammer in Natla, making her fall in the Eitr pool, probably killing her. It's unkown if the fluid is dangerous to any creature (doppelganger, Natla...) or humans (Lara).