Osteomancy presents a set of 11 spells based around the use or manipulation of bone.
At low levels, Osteomancy is defensive, but as the caster becomes more proficient at manipulating bones besides his own, it becomes more oriented towards battlefield control and damage in some slightly body-horror ways that wouldn't be out of place in Ravenloft. The 9th level capstone is a unique battlefield-control spell with ongoing damage and crowd control applications.
Since spells from unofficial sources require DM approval, these spells are not tagged for any specific caster class. They may be appropriate for almost any caster in the game who chooses to follow this sort of theme.
If you're a DM who struggles to challenge or surprise your players, they're also a good way to shock them with something they've never seen before.
- from the publisher's blurb