How terrifying were two flame giants fighting at their full strength?!
The witcher-knights could tell you this with their intense and personal experience.
The Flame Fiend that Leon transformed into, as well as the Fire Lord, endured numerous ice arrows as they walked to the edge of the lava pool. Instantly, the fire spells that filled the skies turned the witcher-knights' shelter into a terrifying sea of flames.
One after another, clay golems coordinated with the stone serpents, and appearing on the battlefield. Every time they appeared out of nowhere, the monsters would pick up a surprised witcher-knight and tossed him into the lava pool. The rest of the job was finished by Leon and the Fire Lord!
Using this method, Leon had already killed four witcher-knights in a row.