Mounts

Mount items go in the Curios mount slot (item tag #curios:mount). The mount key (default V) calls the creature and seats the player on it. The key again, getting off, unequipping, dying, changing dimension or logging out puts it away. Summoned mounts are never saved.

File: data/<ns>/fundamentum/mounts/<name>.json, keyed by item. Only entity is required.

{
  "item": "mymod:bat_whistle",
  "entity": "mymod:giant_bat",
  "speed": 0.3,
  "jump": 0.9,
  "flying": true,
  "flight_speed": 0.06,
  "step_height": 1.0,
  "health": 30,
  "invulnerable": true,
  "body": "minecraft:white_harness"
}

Field	Default	Meaning
item	the file id	the mount item
entity	(required)	any rideable creature
speed	the creature's own	movement speed attribute
jump	the creature's own	jump strength (horses and the like)
flying	false	flies where the rider looks
flight_speed	the creature's own	flying speed
step_height	the creature's own	blocks it steps up
health	the creature's own	max health
invulnerable	true	mounts take no damage unless this is false
body	none	an item for the body slot (26.1.2: e.g. a harness for a happy ghast)

Vanilla horses come tamed and saddled. On 26.1.2 every tamable creature is tamed, anything that can wear a saddle is saddled, and creatures vanilla gives no steering (pig, strider, llama, dolphin) are steered by Fundamentum.