The Immortal Sorceress Complete Series. Immortal Sorceress

An immortal sorceress on her own is vulnerable. Teamed with a servant of death and an epic found family? Unstoppable. Kat Palon has been on this earth for 900 years, and if it were up to her, she'd hang up her mantle and relax on the couch with unlimited instant ramen. But the world isn't finished with her, and the people in her life refuse to let her give up. With her ex-lover-the servant of death who binds her to this world-her vampire bestie, her human housekeeper and her Seer son, a grumpy military vet, a plucky necromancer (and her undead cat), and a cheerful technomancer, Kat can't deny she's got a solid team on her side. As her past comes back time and again to try to finally put her down, she must rise above the challenges to be what she swore to be: a guardian between magical and mundane.
But the past has been gathering its forces. Will it finally be enough to stop her? The Complete Series includes all five main books in the series, a companion novella, and a prequel set 850 years before the series.