Theoretically; if you had a Robe of Arcane Heritage could you use the Mythic version of Eldritch Heritage to gain access to the level 20 powers of a bloodline? 20-2+4 is definitely over 20...
Part 2: If I can't get access to the Mythic version of the feat and decide to burn 3 more feats getting Greater Eldritch Heritage is there a way to gain access to that level 20 power?
