Naga

A Naga, as seen in the official Promotional image from eidos

Nagas are enemies Lara will face in the Thailand levels, in Tomb Raider Underworld.

Nagas, in mythology, are half women half snake creatures in the Hindu religion and are usually larger than normal humans.

In a promotional image from Eidos,it has been revealed that the in-game Nagas are actually quadruped lizards that will(in great number)snoop around the temple and attack Lara with acid and their claws. They've also been seen in the second official trailer and in some off-screen filmed by fans in GC2008 climbing a statue.

They will be common enemies and not bosses as expected. They've also shown to be very fast and aggressive.