@cryptographic-catalyst answered:
The triangle’s eye squinted for a moment and pictures flickered over its body, before the eye widened spectacularly.
“AGENT FOX MULDER…? OF COURSE~! NOW LOOK AT YOU! AM I A LAST RESORT OR HAVE YOU COME TO TERMS WITH YOUR ULTIMATE GOAL?
WHATEVER. EVERYBODY CAN MAKE A DEAL WITH ME OF COURSE. WHAT IS IT YOU STRIVE FOR~?”
Mulder had been following the enigmatic Bill Cipher through the x-files for years. His imagine appears all throughout history, making his origins and motives one of the greatest mysteries that the agent had ever encountered.
Still, he knew enough. He talked to people who’ve claimed to have met Bill. Apparently is all seeing and all knowing. If that were the case, then his asking what Mulder wanted must just be a formality.
“You know what I strive for.” Mulder kept his voice steady as he stared into the eye. “I’ve wanted the same thing since 1973. I want to find my sister.”
He took a deep breath. He wasn't afraid of Bill, nor necessarily afraid of what he was doing. This was the biggest risk of his life, but he knew it would be worth it. Scully had warned him not to go after Bill, but what did she know? She didn’t even truly believe Bill existed.
“You can help me find my sister.” he said it as a statement, not as a question. “Whatever you want in return, I’ll give it to you.”