during a campaign or after a campaign, your dungeon mast can grant this ability to you.

Mount. you now have a mount that is is as big and as small as you. the mount you have can be any creature that could be ridden. any ranged damage your mount does to a target is equal to (1d8) damage. any melee damage your mount does to a target is (2d6 + your strength modifier). when your mount attacks a target you use one of your actions to command your mount to attack that target. you can dismiss or call your mount at will. when you dismiss your mount, your mount leaves the area. when you call your mount, your mount comes to you until it is next to you. when you die, your mount doesn't die. you can ride the mount you have but it cannot use a flying speed or burrowing speed while you are riding it except to use the ability to glide using wings.

Note: steed type characters cannot take this feat.