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I undid your changes to the Yeti and Goblin Leader pages. The reason they are not part of [[Category:Bestiary Medium Creatures]] is that they are Very Rare creatures, and hence in [[Category:Bestiary Very Rare Medium Creatures]]. Even though I agree it could be a good idea to have these creatures in both categories, to do that we would need to change the Template:Infobox Creature because the Categories are added automatically by the template, not manually.