Excalibur/Prime

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"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 and additional armor,  as well as a  Aura slot, rather than a slot without a polarity. 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, 2013, 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 also the first prime Warframe to come with two different polarities, as opposed to one. This was followed by Ember Prime and Loki Prime.
 * There is a statue of Excalibur Prime inside the Orokin Derelict vaults.
 * Interestingly, at the start of Update 11 Excalibur Prime was given a short-lived full body skin called "Alabaster", which was explained by Digital Extremes as a test skin that was released by mistake. The skin's texture was similar to said Vault statues.
 * Compared to the later prime Warframes, Excalibur Prime has the least cosmetic difference compared to his standard counterpart, with the only significant additions being the Void Key-shaped emblem on his helmet and golden blades along his forearms.
 * When he was released, it was widely believed that Excalibur Prime had a slightly faster shield recharge rate compared to the non-prime variant.
 * While the existence of this feature can neither be confirmed, nor denied, Excalibur Prime currently does not possess this stat change.
 * Much like how Update 14 gave the standard Excalibur an ethereal Skana when using his abilities, Excalibur Prime uses an ethereal Skana Prime with his abilities, which was also added in the same update.