Enka's Enlightened Ekanite Estoc

As you extend the hilt in your hand and murmur a word of command, a beam of green light springs forth from the metal weapon hilt humming with power and producing 10 feet of light immediately surrounding the wielder. The caster becomes proficient with this illuminated longsword and must make a melee spell attack against the target. On a hit, the target takes 1d8 radiant damage. The damage dice upgrades to 1d10 when the wielder is not benefiting from a shield, allowing the sword to be swung with two hands.

Targets with darkvision will have disadvantage on attacks against the caster until the start of the caster's next turn.

The spell deals more damage when you reach higher levels: 1d8+2 at 5th level, 1d8+3 at 11th level, 1d8+4 at 17th level.