Arcane Blast

You create an explosion of arcane energy to damage a single target creature within range. Make a spell attack roll against the target creature, if you hit, the creature takes 1d8 Force damage and is marked until the end of your next turn. When a marked creature takes damage from a spell, it takes an additional 1d6 Force damage. Once the creature takes this damage it is no longer marked

This spells immediate damage increases by 1d8 at level 5 (2d8), 11th (3d8), and 17th (4d8). The mark damage increases by 1d6 at level 5 (2d6), 11th (3d6), and 17th (4d6).