Potential ideas for rare items that I just pulled out of my ass:
-When plucking any bird you have the chance to get an odd feather, several different odd feathers added to a headband could make a feathered headdress which increases CHA by a percentage (good for questing, porting, leadership combat moves if we ever get them)
-When mining out a cave galley you could have a chance of uncovering a treasure room which would have: ancient torchposts, a stone throne and a small chest containing things like gems, skull goblets, troll pieces, or on rarer occasions, a sword hilt which you could bind to any sword for an alternate look an additional affects such as a boost to the sword's base damage, or just a flat buff to stats such as +20 str on the sword. The ancient furniture itself could also be looted for our bases.
(Mining galleys could reveal dungeon entrances rather than treasure rooms, that'd be cool too)
-Incredibly rare white bears that are double the size of regular bears. Makes white bearcape, potentially double stats bearcape stats or a percentage boost to str.
-Giant boars that can spawn in with several normal boars around it. Multi-agro. Drops a large boar tusk which can be used for a handful of nice symbol items and perhaps a new talisman with some interesting effect
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Leader's sceptre could be created out of several parts which can be obtained as rare drops in various dungeons. Wearing the sceptre could double the wearer's authority generation for a kingdom, or something like that
Tons of cool things to be had, but I do like the idea of traveling to different areas or doing different dungeons/quests to form one complete item that everyone wants, even just for an epeen enlargement