Climb onto a Bigger Creature

ActionDMGp. 2712014

If one creature wants to jump onto another creature, it can do so by grappling. A small or Medium creature has little chance of making a successful grapple against a Huge or Gargantuan creature, however, unless magic has granted the grappler supernatural might.

As an alternative, a suitably large opponent can be treated as terrain for the purpose of jumping onto its back or clinging to a limb. After making any ability checks necessary to get into position and onto the larger creature, the smaller creature uses its action to make a Strength (Athletics) or Dexterity (Acrobatics) check contested by the target's Dexterity (Acrobatics) check. If it wins the contest, the smaller creature successfully moves into the target creature's space, the smaller creature moves with the target and has advantage on attack rolls against it.

The smaller creature can move around within the larger creature's space, treating the space as 3. The larger creature's ability to attack the smaller creature depends on the smaller creature's location, and is left to your discretion. The larger creature can dislodge the smaller creature as an action—knocking it off, scraping it against a wall, or grabbing and throwing it—by making a Strength (Athletics) check contested by the smaller creature's Strength (Athletics) or Dexterity (Acrobatics) check. The smaller creature chooses which ability to use.

Raw data
{
  "name": "Climb onto a Bigger Creature",
  "page": 271,
  "time": [
    {
      "unit": "action",
      "number": 1
    }
  ],
  "__prop": "action",
  "source": "DMG",
  "entries": [
    "If one creature wants to jump onto another creature, it can do so by {@action grapple||grappling}. A small or Medium creature has little chance of making a successful grapple against a Huge or Gargantuan creature, however, unless magic has granted the grappler supernatural might.",
    "As an alternative, a suitably large opponent can be treated as terrain for the purpose of jumping onto its back or clinging to a limb. After making any ability checks necessary to get into position and onto the larger creature, the smaller creature uses its action to make a Strength ({@skill Athletics}) or Dexterity ({@skill Acrobatics}) check contested by the target's Dexterity ({@skill Acrobatics}) check. If it wins the contest, the smaller creature successfully moves into the target creature's space, the smaller creature moves with the target and has advantage on attack rolls against it.",
    "The smaller creature can move around within the larger creature's space, treating the space as {@quickref difficult terrain||3}. The larger creature's ability to attack the smaller creature depends on the smaller creature's location, and is left to your discretion. The larger creature can dislodge the smaller creature as an action—knocking it off, scraping it against a wall, or grabbing and throwing it—by making a Strength ({@skill Athletics}) check contested by the smaller creature's Strength ({@skill Athletics}) or Dexterity ({@skill Acrobatics}) check. The smaller creature chooses which ability to use."
  ],
  "fromVariant": "Action Options"
}