Disrupting Blade

As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell's range, otherwise the spell fails. On a hit, the target suffers the attack's normal effect and until the start of your next turn, all terrain within 10 feet of you is considered difficult terrain for any creatures hostile to you and your allies.  At higher level At 5th level, the melee attack deals an extra 1d8 acid damage to the target. The damage rolls increase by 1d8 at 11th level and 17th level.