Karsha is a swordsman with the stats of a mage, and his mana pool is impressive enough to rival most mages. This means he can unleash powerful sword attacks while summoning devastating elemental skills. Among his arsenal, he has a particularly strong fire-type skill he can use whenever he feels like switching things up from his sword.
By summoning a domain of fire, Karsha can enhance his sword attacks, as enemies within the domain suffer a debuff that reduces their resistance. This boosts his fire-type attacks, making them even more potent by harnessing all the fire energy within the domain.
For example, if Karsha uses the new and improved Fire Beams skill inside the fire domain, the runes will quickly absorb more fire energy, significantly amplifying the damage compared to using it outside the domain. It's like how an ice attack becomes much more powerful when used within an ice domain.