Soul Ink a substance that not only bound flesh, but the very essence of a person's being.
It's crafted from the distilled essence of nightshade flowers and the blood of bound spirits, though it appeared as an ordinary black ink when dormant.
But once inscribed upon skin and activated through the ritual, it created an unbreakable tether between souls.
The binding worked through intricate runic patterns tattooed into the flesh, usually hidden beneath clothing where they couldn't be easily seen or tampered with.
Once the ink settled into the skin and the binding words were spoken, the contract became absolute.
A slave marked with soul ink found themselves incapable of disobedience, not through fear of punishment, but through an impossible compulsion that overrode to their very own will.
