Any yml file within the Joins directory will handle all Join animation configuration
In this instance, "warp_pipe" is the animation ID for the player
Duration is the amount of time it will take for the player to become visible following the start of the animation (This value is in ticks. (20 ticks = 1 second))
The permission is the permission required to either play the animation or set the animation via the [/animcore set] command.
The mm-id: correlates to the mythicmobs mob id to spawn the mob
You can find this in your MythicMobs plugin folder.