Simon felt an intoxicating power he could not put into words flow throughout his entire body.
The biggest change was his demonic heart.
After the implosion of his Chaos Flame, his demonic heart was on literal flames and these flames spread across his body.
The state of his demonic heart was somewhat similar to when he was a Fiend.
A Fiend possesses a Burning Heart, while an Archfiend possesses an Infernal Heart.
The two hearts were similar... They both burned with the flames of chaos.
However, an Infernal Heart burned with the elements of the demon.
Simon could feel the wind, ice, fire, shadow, and spatial energies making changes to his body.
His body was already built in a way that was compatible for each of these elements, but he still gained more after becoming a Fiend.
Though, the degree of change was based on Simon's affinity grade for each of these elements.
