Zoltraak

A large, bright, beam of dark energy shoots toward to a creature within range. Make a ranged spell attack against the target(s), If a creature is occupying the space next to the target they must succeed a dexterity saving throw or take 2d4 Radiant damage. On a hit, the primary target takes 2d8 Radiant damage, and its speed is reduced by 10 feet until the start of your next turn. 

The spell's damage increases by 1d8 when you reach 5th level (3d8), 11th level (4d8), and 14th level (6d8).