This is my normal Umbral [Valkyr] build. I have tested this in 1 hour Arbitration endurance, and suffered no deaths. This build has just enough survivability for 1 hour Arbitration and is to be used with melee. To use with maxed out Umbral mods, forma an augment spot with the Zenurik (Scratch) polarity.

Use Paralysis to stun enemies and drag them to you. This is your main form of crowd control with this build. It is not recommended to spam paralysis however, as double-tapping it will send enemies flying as it is bugged. Unless you want to yeet everyone.

Use Empower before every Warcry, to get the most armor and speed buffs, and before Hysteria to get higher damage.

If you prefer overall survivability over very effective crowd control, replace [Overextended] with [Adaptation], and replace [Prolonged Paralysis] with [Carnis Carapace], [Gladiator Aegis], or [Gladiator Resolve].

Use whatever Arcanes you want. I would recommend melee Arcanes, as this build is meant to be used with melee, or use extra survivability Arcanes.