Potion, rare
A weird purple substance, it seems to glow in the dark...
After consuming Aether Blood, when a creature uses a spell slot, it counts as 1 spell level higher when determining the level the spell was cast at. If the spell has no additional effects when cast as a higher level, the Aether Blood has no effect. This effect lasts 1 hour.
If a character consumes Aether Blood a number of times equal to their CON modifier, they become addicted to it. An addicted creature must consume Aether Blood once every 24 hours or have disadvantage on CON ability checks and saving throws. The addiction lasts until the creature is targeted with a greater restoration spell, or after 30 days of not consuming Aether Blood.