The fire mage's ultimate skill wasn't bad, and its damage was about the same as a Spellblade's.
However, compared to an Archer's ultimate skill, it was far inferior.
the archer's wrath of the stars dealt ten times the damage, while the spellblade's invincible slash and the fire mage's rain of fire dealt five times the damage.
However, rain of fire had a huge advantage. The cooldown time of this skill was only twelve hours.
The cooldown time was half of invincible slash and wrath of the stars, and he could use two ultimate skills a day, which was a clear advantage.
Furthermore, Fire Mages had a passive skill, heart of the flame, which could increase their base attack power by 50%.
In that case, five times the damage should be enough, and the skills would last for five seconds.
No matter when, no matter how tanky a player was, it was impossible for them to withstand the damage of a rain of fire for five seconds.