World Tendency is a concept that only appears in Demon's Souls and no other game (not even Dark Souls) so I don't think that qualifies as a concept for the wiki.
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Hm really? I was always under the impression that something had to appear in multiple games before it can be considered a thing. Personally, I'd think it'd make more sense to have a section for that unique concept on the page of the game it appears in.