IMO, not having a list of all spells/skills to a guild is a good thing. It would take the mystery and fun out of the guild if you knew everything about it already. Once your’e in the guild, having a posting on the board by another member is entirely worthwhile though, in terms of training/etc. But if you let everybody on the outside know all of your guild secrets, then they can use them against you.
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'I leased my soul to the Devil...with an option to buy'