Rhino/Prime

Release Date: March 27th, 2014

Rhino is a heavily-armored Warframe with the strength and fortitude of his reckless, stampeding namesake. Rhino trades speed for power and is designed to fill the tank role in a cell, with the capability to charge into the fray, draw enemy fire, and bend the battlefield to his will through sheer brute force.

Trivia

 * Rhino Prime was the first Warframe to have an ability modified specifically for its primed version.  In this case, Rhino's Iron Skin is gold instead of silver and appears to cover more of his body, yet the name stays the same.
 * Rhino Prime is also technically the first Prime that goes against previous statements from DE that primes would not be any better stat-wise, and has a slightly faster sprint speed.
 * This stat increase has a noticeable in-game effect, especially if the Arcane Vanguard helmet is used.
 * Excalibur Prime had a slightly faster shield recharge rate when released.
 * Rhino Prime is the only Prime Warframe that has a non-static model, with what appears to be a continuously-moving golden wind-up key at his back.