Cool as they might be there are mostly relics that will cause a huge imbalance in the game:

Double se from hunts??? Can you imagine the players with this relic? They will shoot so far ahead that noone will be able to match them
Get back the se you build: I have 86M build. Again imagine if i get that ammount back.... enough said
Champion medals are for champions only. Using ducats to buy them would just cancell their signifigance.

On the plus side, +5 in abilities or +2 skills (as a one time relic, not one you can repeat if you got it) is a nice idea. Same for clan building going up a level, or the 5 pets bonus (like the toughness belt, maybe a horde belt? )