Upgrade your OSR Magic-Users with Magical Theorems & Dark Pacts.
This tome provides everything you need to run a spellcaster in Labyrinth Lord or classic 1981-styled OSR games. This tome includes full rules for playing Clerics, Wizards, Elven Swordmages, Elven Warders, Enchanters, Fleshcrafters, Healers, Inquisitors, Merchant Princes, Necromancers, Pact-Bound, Theurges and the Unseen - along with all their spells, a collection of magic items, and a variety of new elementals to summon.
This supplement is not a full RPG, but is designed as a supplement for Labyrinth Lord or any other OSR-styled RPG.