Excalibur Prime

Excalibur Prime is a limited edition Founder's class. Its abilities are identical to Excalibur's except the Prime has one additional V polarity slot and slightly faster shield regen. ''Please note that concerning mastery, Excalibur and it's Prime version are considered seperate for unlocking mastery levels. That is to say, each has it's own 6000 mastery point contribution for reaching level 30.''

Acquisition
The Excalibur Prime Warframe is only obtainable through upgrading your account to Founders status of Hunter or greater. It comes with its own warframe slot and already augmented with an Orokin Reactor.

Cosmetics
Excalibur Prime can be equipped with an Avalon helm too. 
 * Shield capacity +25
 * Health -5%