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“Magical Theorems & Dark Pacts” (MTDP) is a rules supplement published in 2013 by Dyson Logos. It was ostensibly written for Labyrinth Lord (LL), but of course works with pretty much any old-school game in the vein of B/X, OSE, or White Box with no or minor adjustments. It contains a host of spellcasting classes, some new and some re-worked traditional classes, as well as new spells, monsters and magic items.

Some of the classes we’ve seen before on Dyson’s blog, like the Elven Warder, others appear to have never been seen before this book was published. There are 11 additional classes detailed, among them the Enchanter, Fleshcrafter, Necromancer, Inquisitor and Unseen.

Some were totally unique at the time, like the Pact-Bound, a class that derives its power from a powerful evil and suffers consequences as a result. Others are more like combination classes, like the Theurge, a Magic-User/Cleric hybrid. All have their own spell lists, with some totally new spells and some existing ones taken from the LL rules. Some classes now have spells to level 10.

Here is the full list:

  • Cleric
  • Wizard
  • Elven Swordmage
  • Elven Warder
  • Enchanter
  • Fleshcrafter
  • Healer
  • Inquisitor
  • Merchant Prince
  • Necromancer
  • Pact-Bound
  • Theurge
  • Unseen

Following the new classes, the spells are detailed in full for every class (but in alphabetical order, a much more useful ordering for when you need to lookup a spell quickly), followed by a chapter of new magic items.

There are quite a few new magic items of all types, including potions, rings, staves, wands and miscellaneous. There is a new type of miscellaneous magic item, the charm, which provides some small magical effect, or combat or save bonus depending on the type. There are about 16 of those, then finally a section on ‘Mitral Spheres’, similar to Ioun stones but not as powerful.

The next chapter details new types of elementals and a monster referred to in the spells section, the Flesh Beast. Lastly, there is a final chapter on how to use MTDP with the Advanced Edition Companion (free no-art version). All told, this is a wonderful resource for your LL/BX/OSE campaigns. It’s very easy to pick and choose classes and options you want to use, and anything you don’t use is at least good fodder for your imagination. There is no art to speak of – this is purely a utilitarian work. I don’t have an issue with this, but I know this is purely subjective. My only gripe is with the chapter sub-heading fonts, which are strangely unreadable until you get used to them.

The book is still available on DTRPG and in print on Lulu.

Link to forum discussion