True Flame

Damage of Firebolt and Fireball is increased by 10%.
Fireball applies Weakness to the enemy for 0.75 seconds, but no more than once every 10 seconds.

Damage of Firebolt and Fireball is increased by 20%.
Fireball applies Weakness to the enemy for 1 seconds, but no more than once every 10 seconds.

Damage of Firebolt and Fireball is increased by 30%.
Fireball applies Weakness to the enemy for 1.33 seconds, but no more than once every 10 seconds.