In Monster Hunter World: Iceborne, the best fire dual blades are the Kjarr Fire dual blades. These dual blades have a high base attack power and a natural affinity for fire damage, making them ideal for taking down monsters that are weak to fire. They also have a unique ability called “Kjarr’s Wrath” that increases their attack power when they are drawn.
The Kjarr Fire dual blades are a rare drop from the Arch-Tempered Kulve Taroth raid. They can also be obtained by completing the “Safi’jiiva’s Dominance” event quest. Once you have obtained the Kjarr Fire dual blades, you can upgrade them to their maximum potential by using materials from the Guiding Lands.