Bawss.

Blaze:

Differences:
Darker color, Darker mane and tail (and fire tips), different cutie-mark, deeper voice, brititish accent, different weapon, eye marking, glowing completely orange eye.

Origins:
On the night of Nightmare Moon's return, Inferno and his friends were protecting Ponyville from masma, (stuff that did this Luna ----> Nightmare Moon). In the battle Inferno was overwelmed by it, BUT! since he already had some in him (he had since the age 22) the masma awakened the stuff inside of him. Creating Blaze. Inferno had to travel deep inside of his mind to fight Blaze, he lost 5 hours (minutes (Inception Reference)) later he became strong enough to defeat him.

Weapon:
Blaze dual-weilds 2 short swords: Black Fire (right) and Shadow Flames (left). He tears Bane of Forests into 2 creating the swords, and it has the same properties as Bane of Forests.

Personality:
Like Inferno, Blaze is aggressive, unlike Inferno though, Blaze isn't loyal nor humorous (though tries not to be), he's all bussiness.

Signs to watch:
Mane and tail flickers then turning darker, voice changes, unawareness, light-headness, morphing cutie-mark, slurred speach and then ends with passing out.

I rushed cuz I had to do it a second time.