*Please note that while Ignus takes no damage from being burned, he can still be burned
Epic Weapon: Scalding Scepter
Def: + 5%
Feed on Flames: Heals self 10% of damage dealt when dealing damage to a burning opponent AND when burning has a buffed crit (by 40% (same as voodoo chant)) and regens health. Starts the dungeon burning and is more susceptible to burn.
Pyromaniac II: 3x damage to burning foes (Because he neeeeeeeeds it... because he waaaaaaaants it)
Burning touch: Chance to burn on basic attacks (subject to I, II, or III) because he fires red, hot lookin' stuff
Burning skin (when burned): Chance to burn melee attackers (Ignus just wants to spread the love)
Heist move change: Heist will now steal the burn debuff as it now buffs Ignus
Epic Effect: 10% chance to deal double damage to the target, Ignus inflames self, and heal all fire allies (even The Furnace because the healing comes from flame, the same thing that keeps The Furnace going)
Materials: Scalding Scepter (picture in comments), Incendiary Powder, Fiery Will
Some of these aspects should be implemented before the Epic, like Pyromaniac II and Burning touch (maybe feed on flames too, as it is similar to Zomm's "Welcomed Fever" and "Feeding on the Living" that actually works on the undead too...)
Just btw, zomm can eat The Furnace's Brain... The Furnace has a brain? That's some twilight zone stuff.