They had finally perfected the acceleration charm for the Dark Lord’s potion, and in a week’s time, they would be casting the spell on the potion to complete it. Hermione guessed, with the potion being of dark origin, the spell itself would also have to be a variation on old magic or something that had an element of darkness to it. When she had been looking through the last of Bellatrix Lestrange’s journals that had been discovered at Grimmauld place, Hermione had struck gold, finding an interesting theory on charm work and how to make any original charm work into something darker.