The Elder Lich had fulfilled its task without breaking a sweat. And despite being a high-ranking undead, it was bound to the Nightmare card in Xander's possession, making it subservient to him.
Having vanquished its foe, the Elder Lich picked up its crown from the ground, shook the dust from it, and carefully placed it back upon its bony skull.
"I have served you faithfully, master. That disgusting flesh bag won't be bothering you again," the Lich spoke in a respectful tone, its head bowed in front of Xander as a mark of its submission.
Xander acknowledged with a nod of his head and replied, "Thank you for your service. I...really needed your help there."
"Think nothing of it." The Lich lifted its head and stood up tall and straight. "I am bound to you by my card. And as long as you hold the power of my card, I shall serve you like a loyal servant."