Granted I haven't checked the alchemist ranks in a while, but it only took me like 2 days of semi-serious attempts to get onto the ranker list starting from only a couple thousand at best. It's really nothing remotely difficult yet, at least for the alchemist regard. Even if I have dropped off since then, I don't doubt I could probably rank myself in a day again.
Also to explain Rennay's sudden appearance. Let's just say I donated a lot of help. Like for starters, over 1,000 pure oridecon.
