Blade of Sigils

Creatures other than you in a 5-foot Emanation take 2d10 force damage as a great blade of force slashes through the area. A successful Dexterity saving throw reduces the damage by half. Creatures who fail the save are also marked by a glowing rune above their head until the start of your next turn. Creatures so marked have their location identified if Invisible or hidden, and have a penalty of 1d4 on their attack rolls and ability checks.

Using a Higher-Level Spell Slot. The damage increases by 1d10 per spell slot level above 1st.

Adapted from the D&D 4th Edition Forgotten Realms Player's Guide.