Eldritch Surge

Using eldritch energy, you bolster your combat prowess. Until the spell ends, any attack you make deals an extra 1d6 damage on a hit. This damage is Cold, Necrotic, Psychic, or Radiant (your choice when you make the attack).

In addition, while in Dim Light or Darkness, you have Advantage on attack rolls.

Using a Higher-Level Spell Slot. The damage increases with a spell slot of level 3–4 (2d6) or 5+ (3d6). Additionally, your Concentration can last longer with a spell slot of level 2–3 (up to 8 hours). If you use a level 4+ spell slot, the spell doesn’t require Concentration and lasts until you finish a Short or Long Rest. You don’t gain this spell’s effects on attacks that also benefit from extra damage granted by a different spell you cast that requires Concentration.