Yeah. Some people confuse the names Mystra and Mystara. Mystra is (as mentioned) Goddess of Magic. Helm used to have a say in this too, but Lord Ao did the divorce settlement
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Mystara is the hollow planet setting for D&D. Different Gods and so forth. (mmm - civilisation on the outside, nice and bright on the inside)
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In the kingdom of the blind, the one-eyed man is pimp