To answer your first question it happens about 2 game weeks after you retrieve the nether scroll with edwin in the party. At the end of the first week he proclaims he's starting to decifer it and gets lots of exp. At the end of the second he reads the scroll, resulting in his transformation. Lots of hilarious conversations ensue as noone has any sympathy for him what so ever. It will eventually be reversed by another wizard several weeks later. Try telling him (her?) that he has nice jugs.
To your second question, he is around the portals. Try looking where he first appeared.
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