So.
This is my Anty-Knockup Umbra.
With my other builds:
https://overframe.gg/build/114556/ Nikana
https://overframe.gg/build/114563/ Daikyu
https://overframe.gg/build/115438/ Exalted Blade

it makes deadly solo-carry badass great for Survivals, and most of other missions

With lot of Efficiency, Power and Duration your Warcry from [Valkyr] helps to mitigate the lack of Attack Speed in my [Nikana] Build
Also Blind works well but in really small rooms just as Dash

Hope you will enjoy it anyway.

[Excalibur] passive, Warcry from [Valkyr] and Arcanas are for nice attack speed that is reduced with mod on my [Nikana] build. It makes it even easier to keep your attack speed on good level.

Your 4th ability is useless a bit and you shouldnt use it if you getting big dmg yourself. Your lightsaber should be used against specifical targets (build in progress) and when you are sure you can survive without lifesteal.

Have fun cutting down everything