Witch's Brew is a term used to describe a magical POTION or concoction that is often used in witchcraft. The crossword solutions for this term are 'POTION' (6 letters) and 'BANE' (4 letters). A POTION is a magical liquid that can be used to create a variety of effects, such as healing, transformation, or protection. BANE is a term used to describe something that causes harm or destruction. Together, these two words form the term Witch's Brew, which is a powerful and potentially dangerous concoction.