Ibi took a breath. "Well, in ancient lore, there were always four Archmages: Justice, Valor, Hope, Courage. Each one was a true master at one element, making them incredibly powerful. The original four learned of the Aether, and it's tendencies to either totally destroy, or totally control any situation. The original four managed to seal it away, before it destroyed their home city, but they knew that their work was far from over - so they spread to the four corners of the world and protected it.
One young Mage, whom had witnessed the Aether being sealed away, became jealous after Bearding its power, and taught himself how to transcend auric limits. He quickly learned all four elements and became very strong. His mind and body corrupted further and further as he exploited this loophole in Aura, until he was completely unrecognisable. He changed his name to Malric, and became the first - and only - Corrmage.
While Archmages are good, they strive to protect others, the Corrmage only desires to destroy the Archmages and take the Aether for himself, becoming truly indestructible. We have had that Corrmage encounter us several times, but he never managed to take Mara's power. He knows how, though, due to him learning it after our last encounter. So you now know why we need to get to the temple so quickly. He's only a few miles behind us, and he can fly."
Ibi could have sworn, if the wagon was still, they could have heard a pin drop.