Excalibur/Umbra

Excalibur Umbra is the Umbra variant of Excalibur, first released in the Chinese build of WARFRAME. It will be released in the Global Build at a later date.

Excalibur Umbra is not yet available in the Global Build.

Official Information
Digital Extremes has disclosed that Excalibur Umbra is to be the first of the "Umbra" Warframe variants. He is to come with its own unique system of acquisition, as a means to make Excalibur Umbra's release special. During Devstream 72, Rebecca Ford compared revealing information about Excalibur Umbra prior to his release to revealing information about The Second Dream, potentially spoiling their intended result.

Like the Prime Warframes before him, Excalibur Umbra will be an entirely separate Warframe, and is presumed to have its own stats and polarities separate from either Excalibur or Excalibur Prime. Excalibur Umbra will also be a "global upgrade" to Excalibur, as opposed to being limited for a period of time.

Trivia

 * Excalibur Umbra will be the first Umbra variant of a warframe to be released in WARFRAME.
 * In the Chinese Build, Excalibur Umbra originated as part of their Founder's pack exclusive, named as Excalibur Umbra Prime.The pack also included the Nikana Prime and the Spira Prime (both of which were introduced in the Global Build with Saryn Prime instead), as well as the Gauvan Prime Sekhara, a shoulder accessory obtainable only through that Founder pack.
 * Umbra is the Latin word for "shadow". What this modifier entails beyond Excalibur Umbra's dark coloration remains unknown.