I use two kinds of magic items that work like Legacy Weapons, in one setting of mine.
In my Kaidan: a Japanese Ghost Story setting, I have both Ancestral Weapons and Ancestral Items. These are weapons that belong to one's family or samurai clan and issued to 1st or 2nd level adventurers as a gift after a single small 'honorable' incident/adventure. Rather than gifts they are loans from the clan leaders and represent great honor in bearing them.
Like Legacy Weapons, if they are lost or sundered, they are unreplaceable. In Kaidan all crafted items involve the creators placing a bit of their souls in everything they make, it is not deliberate just a natural occurance in working the material. In old Japan it was believed that any crafted good that lasted a century, became sentient to a degree.
In Kaidan, when one wields a masterwork item, she is, overtime, placing her own soul into the item in its use, but cannot become magical until she dies and it passes on to her descendants. With the next descendant the same thing happens, over several generations, the item becomes enchanted, without intervention by a wizard.
Once 'enhanced' these ancestral items grant magic bonuses for weapons, granted powers (weapons and items), and transferred 'feats' from ancestors to descendants. These powers become available in levels ups, combined with event triggers that require small 'quests' and a prayer vigil at a temple to activate. These weapons and items often have 3 - 9 powers.
One must have the ancestral item feat, in addition to possessing an ancestral item. These cannot be purchased, only found or granted. However, if the item is not of your ancestry, items found are masterwork only. In the hands of a descendant they awaken and only at appropriate levels.
This way an adventurer can possess an item or weapon, that levels up along side her, not requiring constant replacing in your 'magic shop' or contracted to 'artificers'.
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