Wizard Arcane Traditions: School of Necromancy 5e — Caverns & Creatures

The School of Necromancy is supposed to be Wizard’s best way to become the lich of legend. It's a monstrous archetype, commanding legions of the dead to conquer the world backed by plagues and areas of death and destruction.

Wizard: Schools of Effect. 5 Arcane Traditions based on the more obscure schools of AD&D : r/UnearthedArcana

Dungeons & Dragons – Page 24 – Nerdarchy

Calaméo - Dn D 5e Players Handbook (Bn W Ocr)

The Wizard's Brewery: New Arcane Tradition; White School Necromancer (D&D 5e )

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Lich, Forgotten Realms Wiki

Arcane Tradition: Nullimancy (5e) - Wyrmworks Publishing