While holding this staff, you can use an action to expend one of your spell slots to begin firing a beam of frost in a 60-foot-line that is 5-feet-wide that originates from you. The beam always originates from you, and if you move the beam will move with you but keep its direction. When a creature enters the beam’s area for the first time on a turn or starts its turn there, it must make a Constitution saving throw against your spell save DC, taking a number of d6s of cold damage equal to double the level of the spell slot used on a failure, and the creature’s movement speed is halved during its next turn. A creature takes half damage on a success and has no reduction to movement. This beam remains until the start of your next turn.
At the start of your subsequent turns you may choose to use a bonus action to expend another spell slot to keep the beam active. The beam’s damage will change to match the level of the new spell slot that was expended. Additionally, as part of this bonus action you may change the beam’s direction.
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