Binding Light

You release a sphere of light that immobilizes burns up to two creatures. Each creature within a 30-foot long 5-foot wide line must make Dexterity saving throws. The two closest creatures to you that failed their saving throws take 8d6 radiant damage, their movement speed becomes 0 and they can’t benefit from any bonus to its speed until the end of their next turn.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.