It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

Okay, got it after all. I meant to pose this as a question, but I found the solution:

"The first letter of the plant they call 'Truthsayer'" -> "Lisle of Neptune - Boletus Veritum"
"The number of petals on a lucky Cabillia flower" -> 6 Petals usually, but if it has 7 it brings good fortune.

So: L7
Yeah, the 'lucky' part is definitely easy to miss :) Glad you were able to figure it out by yourself!