Weird: maybe you're on the same network as someone who got banned from the wiki?
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I have no other clue as to why it wouldn't work, as I just edited
https://wiki.project1999.com/Large_Sky_Sapphire without problem.
P.S. As an aside, that really should be two separate items in the wiki: Large Sky Sapphire (Enchanter) and Large Sky Sapphire (Wizard) ... with the original page linking to both. But I'm too lazy to fix it right now.