So before they re-nerfed the Phaun Tower i was able to get the following breeds to empower. Sadly Phaun has become useless again, but hey I get to keep my thousands of gems. And FYI SP not only did you kill Phaun but you also killed the opportunities of me buying gems to continue using it...good job on your part.
Legacy [breed parent]
3 [Breed Parents]
Pure Dark, Electric, Sea
Gorge (after nerf, 7 of 13 were Gorge dragons)
Next week I will test what my ratios are for legend dragon's with the nerfed tower.