Dark Alchemy is a Brain Buster exclusive to Dark Ages in Plants vs. Zombies 2. The lawn in this Brain Buster has magic potions placed on some tiles; these have the ability to grant either speed or toughness bonuses to zombies that step on them. Effects will stack up to three times per potion. Zombies hypnotized by Hypno-shroom can also be affected by potions. Plants can not be planted on these tiles. During Dark Alchemy levels, potions will continuously spawn on empty tiles. The only way to destroy potions is by crushing it such as a hypnotized Gargantuar, a Barrel Roller Zombie's barrel, or a Pianist Zombie's piano.