Slow Burn

Sufficiently skilled fire scholars learn to prolong the effects of their spells. First and foremost, the fires set by the immolate spell will last longer. Second, their area-effect spells will also immolate those caught in the blast. Thirdly, when immolation ends, the lingering smouldering wounds will severely hinder the victim's ability to heal. Finally, consuming wounds (such as those left by immolate) will reignite themselves more efficiently.