Divide And Conquer
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We divided and conquered. Three teams, as quickly as possible. The vampires didn't stand a chance. With my divided powers I was still vastly overpowered. And I could share any ability between each other, such as my power to meld within darkness and hide inside of it.
With that, we were able to easily capture any vampire we found, kill them, and move on. Through all three routes. Eventually, we reached the end of every route after killing like four hundred vampires, it wasn't anything worth nothing, they died almost instantly from one of my attacks, though I left my friends and family kill them by ganging on them to get the most EXP.
Eventually, we reached the sealed and guarded facilities. The guards were still completely unaware of what was happening, though I was sure they would get a wing of it very quickly.
"So what do we have for dinner?"
"I don't know, more blood?"