"That one, you might want to be careful with that. It doesn't like people..."
"A potion? "
Rustcaller Toxin is not a tool of assassination, but instead a weapon of random terror.
A brace of sleep-related poisons.
..The inn was filled with the sounds of leather creaking and seams bursting, as muscles swelled and grew dramatically. Then came shouts of fury and rage as the mob began charging outside, into what would be a very bloody night.
Destroyer of Dynasties, Killer of Kings, Bane of Broods, Curse of the Ruling Elite!
Believable magic, like ordinary physicis, operates according to some invariable laws that always result in some kind of cost or "bounce back". The grater the magic, the more it should cost the character physically, emotionally, and spiritually.