Excalibur/Prime

"Excalibur Prime is the epitome of mobility and offense, and features the same abilities as Excalibur, but has unique mod polarities installed allowing for greater customization."

- In-game Description

Excalibur Prime features an additional  polarity slot,  as well as a  Aura slot, rather than a slot without a polarity, but is otherwise identical to the Excalibur. Excalibur Prime is a founders-exclusive Warframe.

Acquisition
This Warframe is no longer available, and will not be available again due to it being exclusive to certain Founder packs. The Excalibur Prime Warframe was only obtainable by upgrading a Warframe account to Founders status of Hunter or greater, which is no longer available. The Warframe came with its own warframe slot and was already augmented with an Orokin Reactor.

The Founders' program closed on the 1st of November as announced on the warframe forums. This closure is inclusive of pack upgrades.

Trivia

 * Excalibur Prime is the first Prime warframe in game.
 * Excalibur Prime is the one of the Prime warframes to come with two different polarities, as opposed to one.
 * The next warframe to have the same similarity is Loki Prime
 * There is a statue of Excalibur Prime inside the Orokin Derelict vaults.
 * At the start of update 11, Excalibur Prime came with a special body skin called "Alabaster". However, it was short lived as this skin was apparently just a test skin that was accidentally released publicly. The skin's texture was similar to that of the Orokin Derelict Vault statues.
 * Excalibur Prime has the least significant difference in cosmetics compared to other Primes. The only significant addition is the circle emblem in between his nose and forehead area, forged against its helmet.