Divine Smite

Class featurePHBp. 822014SRDPaladin

Starting at 2nd level, when you hit a creature with a melee weapon attack, you can expend one spell slot to deal radiant damage to the target, in addition to the weapon's damage. The extra damage is 2d8 for a 1st-level spell slot, plus 1d8 for each spell level higher than 1st, to a maximum of 5d8. The damage increases by 1d8 if the target is an undead or a fiend, to a maximum of 6d8.

Raw data
{
  "srd": true,
  "name": "Divine Smite",
  "page": 82,
  "level": 2,
  "__prop": "classFeature",
  "source": "PHB",
  "entries": [
    "Starting at 2nd level, when you hit a creature with a melee weapon attack, you can expend one spell slot to deal radiant damage to the target, in addition to the weapon's damage. The extra damage is {@damage 2d8} for a 1st-level spell slot, plus {@damage 1d8} for each spell level higher than 1st, to a maximum of {@damage 5d8}. The damage increases by {@damage 1d8} if the target is an undead or a fiend, to a maximum of {@damage 6d8}."
  ],
  "className": "Paladin",
  "classSource": "PHB"
}