Comet Azur

You fire a powerful comet in a torrent, channeling the power of the origin of glintstone in a line 150 feet long and 5 feet wide. Each creature in the line must make a Dexterity saving throw. A creature takes 10d10 force damage on a failed save, or half as much on a successful one.
On subsequent turns until the spell ends, you can use your action to continue firing. When you continue firing, you can choose to change the direction of the line. If you move or take another action, the spell ends.