Nyx was an experimental biological weapon stored in Raccoon City. It was named after "Nyx", the Greek goddess of the night.

Tier: At least 9-A

Classification: B.O.W. (Bio Organic Weapon)

Powers and Abilities: Superhuman physical characteristics, absorption/transformation (Can mutant and increase in size the more organic matter it absorbs), regeneration (High-Low), resistance to pain, and corrosion inducement

Attack Potency: At least Small Building level (Stronger than a Tyrant)

Speed: Superhuman

Lifting Strength: At least Class 10, likely higher (Can easily subdue Tyrants)

Striking Strength: At least Small Building level

Durability: At least Small Building level (Very hard to kill even when using magnums and rocket launchers)

Stamina: Unknown

Range: Several meters physically and with projectiles

Intelligence: Seemingly Mindless, at most Animalistic

Weakness: Nyx's weak point is actually its heart, which will open after the monster has suffered much damage, a trait that the Nyx took after the Tyrant it absorbed.