Grave Chance by D.D. Miers

Vexa has entered the endgame with her lich ancestor, Aethon Tzarnavarus, and the prize for winning is the ability to determine the fate of the world. Only, Aethon’s targeting her family, and Cole’s, and it’s only a matter of time before he takes everyone that they love from them.
Ethan’s life under the werewolf curse, Cole’s trepidatious but precious love, and Gwydion’s immortal existence are all at stake, and the community Vexa’s built, the family she’s chosen for herself, may fall apart whether she survives to beat Aethon at the death game or not.
The final battle for the life or death of all humanity is upon them, and as Aethon nears his apocalyptic goal, the stakes have never been higher.