Fiers

Fiers is a dwarven planeswalker, revered as a god by Dominaria’s dwarves. He was summoned by Karona as the deity of red magic.

Fiers is part of a heavily-debated continuity issue, along with several other popular characters. While Karona spoke with Fiers during the novel Scourge_(book), the meeting was later retconned, though no explanation has ever been provided. It is possible that Fiers is indeed a planeswalker, but if the retcon is to be believed, then the real Fiers has yet to appear in any novel.