Urobolus is the final boss of Xenogears, taking place after defeating Deus and its counterparts. Despite being the final boss, she is extremely easy and it is almost impossible to lose against her. Karellen, wishing to know the true nature of human kind (Love), puts Fei Fong Wong through one final test, this time against Myyah as the 'Urobolus', the final incarnation of her true self. In this form, she is half human and half serpent, with angelic wings. Both Fei and Myyah/Urobolus are naked in this fight, and Fei fights her in Xenogears.