You can't do so yet. After you have a conversation with him on the elevator to the third level, it's implied that you'll likely need to know magic to get to him without him killing everyone in Akra, so you need to explore space until you find Harmonia and that's where the story continues (and where updates are currently at).
If I had to guess which stat you need, it's probably perception. I had like 6 or 8 perception and after a few tries I would get a successful roll, though I'm not sure if it's something you really need to pass.