Crystal Ram

A blast of magical energy forms in font of you, and forms a crystal Ram that erupts from your hands. Each creature within a 20-foot with and a straight line of 300 feet are hit by the crystal Ram and they must make a strength saving throw. A creature takes 4D8 bludgeoning damage on a failed save and all creatures up to large size are prone, or half as much damage on a successful one.

A creature killed by this spell becomes a large crystal column 6 foot wide and 10 foot high until it destroyed. The column acts like a wall and can be used as cover. 

Extra Feature. When the Crystal Ram hits a wall, floor or ceiling it creates a 10 foot long and 6th food wide column 

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 3 rd.

Power up the spell. With this spell you have the option to use an action to cast the spell but not fire it, you hold the casting of the spell until you next action when you can relate it. Upon releasing the spell any creature hit takes an extra +6 D8 Dice to the level its cast at. So at 3rd level it's 10D8 bludgeoning damage and have no saving throws. All creatures hit are moved 10 foot back and are prone. If you are attacked wile holding the spell take a constitution saving throw of 13 or higher. If failed it explodes and you take 4D8 bludgeoning damage and it throws you 20 feet away, and prone.