Horadric Spells are special, new, customizable spells for Season 9, which allow for unique ways to combine effects using Catalysts, Infusions, and Arcana. These effects are combined to create one Horadric Spell that is automatically triggered when using a class skill.
Season 9 Overview
With a total of 5 Catalysts, 5 Infusions and 20 Arcana effects, there is a vast number of combinations to tweak the power exactly how you want it!