The Slate of Ten Commandments.
It was a powerful artifact found in the Ascent Isles.
More importantly, it was one of the few Academy relics whose effects persisted even outside the Apex Academy — unlike most other local relics, like the Key of Order, which only worked within Academy grounds.
The Slate's function was simple — write an oath on it using your blood, and you'd be bound to it.
Naturally, there were conditions.
For starters, an oath could only be made between a minimum of one and a maximum of two individuals.
All parties had to agree of their own free will to be a part of an oath, completely uninfluenced — no threats, no bribes, no mind control, nothing.
Also, oaths could only be written inside the Academy and had to have a time limit — anywhere from three days to three years.
And once that time was up, you couldn't reuse the same oath again.
Oh, and one last thing — breaking an oath made on the Slate wasn't just difficult. It was physically impossible.