list: API endpoint for returning a list of creatures types.
retrieve: API endpoint for returning a particular creature type.

GET /v2/creaturetypes/undead/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "url": "https://api-beta.open5e.com/v2/creaturetypes/undead/?format=api",
    "key": "undead",
    "name": "Undead",
    "desc": "Undead are once-­‐‑living creatures brought to a horrifying state of undeath through the practice of necromantic magic or some unholy curse. Undead include walking corpses, such as vampires and zombies, as well as bodiless spirits, such as ghosts and specters.",
    "document": "https://api-beta.open5e.com/v2/documents/srd-2014/?format=api"
}