Lifedrinker

Optional featureXPHBp. 1562024SRD
Prerequisite
level: {"class":{"name":"Warlock","source":"XPHB","visibleStats":true},"level":9}, optionalfeature: pact of the blade|xphb
Feature type
EI

Once per turn when you hit a creature with your pact weapon, you can deal an extra 1d6 Necrotic, Psychic, or Radiant damage (your choice) to the creature, and you can expend one of your Hit Point Dice to roll it and regain a number of Hit Points equal to the roll plus your Constitution modifier (minimum of 1 Hit Point).

Raw data
{
  "name": "Lifedrinker",
  "page": 156,
  "srd52": true,
  "__prop": "optionalfeature",
  "source": "XPHB",
  "entries": [
    "Once per turn when you hit a creature with your pact weapon, you can deal an extra {@damage 1d6} Necrotic, Psychic, or Radiant damage (your choice) to the creature, and you can expend one of your {@variantrule Hit Point Dice|XPHB} to roll it and regain a number of {@variantrule Hit Points|XPHB} equal to the roll plus your Constitution modifier (minimum of 1 {@variantrule Hit Points|XPHB|Hit Point})."
  ],
  "featureType": [
    "EI"
  ],
  "prerequisite": [
    {
      "level": {
        "class": {
          "name": "Warlock",
          "source": "XPHB",
          "visibleStats": true
        },
        "level": 9
      },
      "optionalfeature": [
        "pact of the blade|xphb"
      ]
    }
  ]
}