Get a rule section by index.

{
  "type": "object",
  "properties": {
    "index": {
      "type": "string",
      "enum": [
        "ability-checks",
        "ability-scores-and-modifiers",
        "actions-in-combat",
        "advantage-and-disadvantage",
        "between-adventures",
        "casting-a-spell",
        "cover",
        "damage-and-healing",
        "diseases",
        "fantasy-historical-pantheons",
        "madness",
        "making-an-attack",
        "mounted-combat",
        "movement",
        "movement-and-position",
        "objects",
        "poisons",
        "proficiency-bonus",
        "resting",
        "saving-throws",
        "sentient-magic-items",
        "standard-exchange-rates",
        "the-environment",
        "the-order-of-combat",
        "the-planes-of-existence",
        "time",
        "traps",
        "underwater-combat",
        "using-each-ability",
        "what-is-a-spell"
      ]
    }
  },
  "required": [
    "index"
  ],
  "additionalProperties": false
}