A Deal
The cube could suck any race inside, force them to sign a loyalty contract with me. I'd just have to edit a few things about the content of the contract there, and then they'd not be able to even think about jumping back and leaving me behind.
Even if they got their ability ready to use later on, they wouldn't dare to even think about activating it. Once they got killed, it was the end of their lives, and their abilities wouldn't even help.
They weren't immortals, weren't reincarnation or transmigrators, they were simply jumpers. And that was their best and worst thing about their ability.
"It's done," I signed the contract after reading its content, making sure that dude didn't do anything funny at all, "now tell me where are those bastards' locations."
[I'm sending a map over] he paused, [I added little extra touches there. Don't mention it!]