I decided to upload one more video before this year ends.
It's almost impossible to strike a blow for Umah while fighting her but at 1:00 I was surprisingly able to. 99% of time she blocks your attacks and always avoids getting grabbed. You can strike her with telekinesis, though. You can also charm her which will cause her to retreat and stop attacking you. I don't remember correctly, but if you will immolate her three times she will freeze.
To those who don't know why I have all dark gifts and Iron Armor: I use cheats and Bonus Mode.