Uroboros Aheri (Resident Evil 5)

This is the final form of Excella after Wesker injects her with the Uroboros Virus. "Adheri" comes from the Swahili word for "success" or "boundary".

The creature consumes the large pile of corpses on the deck; this is what triggers its immediate and incredible growth. Conventional weapons are nearly useless against it once it grows to this size. Its large exposed core glows with a soft luminescence, from which it fires an unlimited store of tentacle-like, independent organisms.