Thinking about it an idea that had been at back of mind for quite a while is a Horde based Gift/Ability
The way it would work is that when the Gift/ability is active you gain bonuses
based on what "magic" items you have put into your horde
im not entirely sure about best % for this but something along the lines of
1% of sum of enhancements on hoarded items (20)
2% (40)
3% (60)
etc.
with a maximum limit of how much you can get on each skill/attribute
e.g you have hoarded items that give you sum of 2000 in a skill (6% at 100) is 120 point bonus
not having played my dragon in a while im not sure but think that might be a bit much so have to have a suitable maximum for that level
not sure maybe 1 point every 2 lvls for skills so at lvl 100 is limited to a 50 point bonus