Yeah it is very frustrating, most of the time xp loss just happens without any notification about it and I can only guess that some post of mine got removed for whatever reason. I've posted about this in moderator help and got no answers as to what I did wrong.
in 3 steps
Choose the game that interests you and play itfor free.
Every game has some quests for which you will receive Soul Gems.
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Anyway to see specific reasons for XP reduction? I would prefer to know what I did instead of it being anonymous