User blog comment:CaptainMcToasty/RRRRRRRRRRRRRRRRRAGE MODE/@comment-24828824-20140703081052

Jericho Corey is a kind of special case seeing as his 'rage mode' is unrelated to his aura or semblance. rather it is caused by his personality. you can read the whole explination on his page but I'll tell about the source of this rage mode.

one of these source chracters is Major Thalric of the Shadows of the Apt books. Thalric is of the wasp race of humans and like all wasps is born with a nasty temper, the ability to throw fireballs and enough ambition to have the entire race become the first and only superpower of their modern world. Thalric is different however as he can keep a close lid on his more murderous and barbaric tendensies so he can be the calm controling spymaster. however when he gets put into a life or death situation (a surprisingly common occurance) he uses every trick in the book and every tool available to him to make it out alive.

That was the main inspiration for Jericho's 'rage mode', when things get desperate, when he gets desperate he becomes capable of anything to survive, and this scares him. a side effect of Jericho keeping his ambitious, cutthroat nature in check is a tremendous amount of willpower which translates in a surprisingly large boost to his aura reserves. also when he actually gets desperate his aura color changes from silver to gold, reflecting a closer resemblance to Thalric and his wasp heiritage.