EDIT: upon completing every epic quest 10 times, as well as 200 epic dungeon tokens, (maybe even some kind of special quest and ritual) not available in the DDO store:
Epic Incarnation
You get to re-choose your entire life path. Except unlike True Reincarnation, you don't lose your favor, or any of your levels. You simply incarnate into a 20th level character with full class, feat, skill, AP selection.
Additionally, you gain an epic feat, depending on whatever class you take the most levels in. This feat is the same as the class' capstone. If you also get the pure class capstone, your epic feat power is halved.
For example, an Incarnated 20th Rogue would get 4d6 capstone, plus 2d6 epic feat.
An 18 rogue/2 fighter would get the 4d6 epic feat.
Some of the epic feats need tweaking... for example a 20th level Elf FvS would need something besides an invisibility spell on a separate cooldown.
What do you think? An ultimate power type thing to work towards? Some reason to grind epics?