Consuming Flame

You place a trap up to 15 ft away (combat range) that stores a consuming flame.  When the trap is triggered, the enemy must make a Dexterity Saving Throw, or take 1d8 (+ Wisdom Modifier) damage.  If they succeed, they take half.  

At higher levels, the damage is increased to Xd8 damage (+ Wisdom Modifier), where X = the level of spell slot used to cast the spell.  The enemy is also burned starting at the second level of spell slot, where they take an additional Xd6 (+ Wisdom Modifier) damage.