Back Burner

Description
Fire a shot that starts from the left side of the field all the way to the right side that deals 60 damage on contact, leaving Flame on its wake and ultimately causing the entire lane to be lit. The attack itself will not hit the player, but the flames it leaves will damage them as soon as it enters their tile.

Strategy and Synergy
As this spell will set one of your own rows on, it is generally not advisable to use it on one of the middle rows, as it might interfere with dodging unless you don't find walking onto your own Flames a serious issue. You should also pay attention to enemy patterns and when you feel you would be able to forgo being able to safely dodge in an entire row for damage potential.

Having artifacts that are able to synergize well with Flames, such as would mitigate a lot of the risk involving the use of this spell. However, if you have a decent amount of, it might not be the best idea to take this spell, as the risk of taking damage yourself increases proportionally to your Spell Power, since the Flame on your side would end up doing more damage to you.

This spell is extremely helpful (and almost essential) in getting the Watch the World Burn achievement when combined with, as it is a surefire way of setting your own side of the grid on fire.