"This is the operator of White Leviathan, you are trespassing on HADES territory. Pull back immediately, or we will respond with lethal force"-- Anatolia Mercer, the Operator of White Leviathan
White Leviathan is a Titan class mech that is constructed and in service to HADES. It has never been see in the public eye before, or to anyone. After reports of the Beast of War's existence, the org decided to respond with a counter-measure to such a machine.
It's current pilot is the HADES operator codenamed Adonis.