Kai spent the early hours of morning in his dimly-lit workspace. His workspace being an abandoned shed on the academy grounds that he loaded with protective barriers while inside. Nobody was coming in.
Sleeves rolled, hands dusted in powdered bone and charcoal ash. Bone chalk was notoriously unstable to make, and Kai had gone through three ruined batches before finally perfecting the latest mixture. The thick white dust shimmered faintly with residual necromantic energy as he drew precise curves and angular runes into thin obsidian slate.
"I go through these things way too quickly. And I only have so many spare bones that aren't connected to my minions. I should collect more soon."
He muttered under his breath, repeating the sigil formulae as he reapplied each to the ribcages, skulls, and limbs of his undead. The chalk fused into the bone like glowing tattoos. Their hollow sockets flickered with new intensity.