Tool of the Devil

Curiosity overcoming his fear and weariness, Vogir approaches the demonic figure.
“What do you mean?”
The tall Tiefling smiles broadly as he opens up his arms.
“I’m here to offer you power. Power to destroy the loathsome Dragon.”
Vogir is young but not stupid.
“In return for what exactly?”
The demonic creature’s features crumple in mock misery.
“Why for your soul of course.”
Vogir turns away.
“Wait!” shouts the demon. “My master has seen your potential. He has been watching your family for over a century. Rather than the 'standard' pact, he is willing to grant you a small amount of his power simply in exchange for your vow to kill the Dragon. The closer you get to your goal the more powers he will give you.”
Vogir turns back.
“So what you’re saying is that ‘if’ I continue on the path I’ve set myself, your demonic master will gift me an increasing level of his hellish power?”
The tall Tiefling seems to sag.
“I know; I can hardly believe it myself. Still the powers granted will be substantially less than the normal Warlock would be given.”
Vogir smiles a thin humourless smile.
“I accept.”
The Tiefling looks confused.
“Don’t you even want to know my master’s name?”
Vogir’s smile evaporates.
“Don’t worry. I think I can guess.”