Rune Magic
Sheolean
Ancient, "written" magic that enables a spell (not a power, but actual magic) to be performed via a spiritual link to runes placed on something of Sheolean origin.
The runes glow brightly when activated, and dim for a short period after use.
Runes on things.
You don't need to say any magic words or perform a ritual, the rune does what you need it to do, when you need it to do it!
The magic embedded in runes will unravel and disappear if used too frequently in too short a time.
Neither a rune nor its magic can be removed from an item without destroying and recreating it.
Rot, Deception and Blood.
A link to the runes, for one.