While the world of Last Epoch offers adventurers a wide range of gear to suit every taste, Immolator's Oblation is the best belt for your fire build. Besides extra potion slots, this belt will reward the wearer with decent bonuses to the duration and effectiveness of their fire and some necrotic skills. In addition, you get a 100% chance of cleansing all Ailments when using Potions, which is an incredibly nice bonus.