Excalibur/Umbra Prime

Excalibur Umbra Prime is the Founder exclusive Warframe for the Chinese build, as stand-in for Excalibur Prime which in turn was only available in the Global build.

Excalibur Umbra Prime was released together with Spira Prime and Nikana Prime (both later released in the Global build with Saryn Prime) as well as the exclusive Gauvan Prime Sekhara.

Regarding stats and abilities, Excalibur Umbra Prime is a direct copy of Excalibur Prime, possessing Radial Blind (instead of Radial Howl), the passive ability to replenish energy through Orokin Death Orbs (instead of acting like a Specter during Transference) and no polarities.