Theren's Sidespell

using the available time and energy you have from just casting a spell, you exert yourself further to quickly expel even more magical energy. 

pick a target within range that you can see, and make a spell attack roll against that target. on a hit, the target takes force damage equal to 1d6+your intelligence modifier, taking half as much on a miss. 

the energy loss from casting spells in quick succession drains you. you take necrotic damage equal to half the damage dealt by this spell. 

At higher levels: the spells damage increases to 2d6 at 5th level, 3d6 at 11th level, and 4d6 at 17th level.