Arcanum Magicka

Takes place five years after Guardians of Sanctuary. Wildfyre has discovered her mother Kefka, had been with others before her father, as well as after she'd walked out on Wildfyre and her father. When Wildfyre finds out she has siblings, accompanied by Lyndon and Eirena, she goes on a journey to Estuar to discover them. She is disappointed to learn that not all of them are as keen on meeting her.

But then they discover Inarius' plan to destroy humanity and band together as the Arcanum Magicka, with Lilith's blessing and gifted powers, to destroy Inarius before he wipes out their very existence.

Snowfyre (33) and Wildfyre (23) are twins. Their age gap and the time-lapse between Estuar and the Western Kingdoms will be addressed somehow at some point. Everything I see says that Diablo IV takes place 30 or 50 years after Diablo III. For the sake of this story, I am placing the fanfic at 25 years after the events of Diablo III.

Fire - Wildfyre, Fire Wolf, Fire Wizard (twin)
Cold - Snowfyre, Frost Wolf, Cold Wizard (twin)
Lightning - Sparky, Cackling Devil, Nephalem
Poison - Belladonna, Holy Harvester, Necromancer
Shadow - Rhoslyn, Amber Wolf, Rogue
Magic - Nikolai, Righteous Guardian, Druid
Physical - Jayden, Transcended Horadrim, Monk

Fair warning. The world is from the Diablo universe. Characters are my own, but based on Classes and abilities from the games. I do not know what License this falls under.