Mounted Combat
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A knight charging into battle on a warhorse, a wizard
casting spells from the back of a griffon, or a cleric
soaring through the sky on a pegasus all enjoy the
benefits of speed and mobility that a mount can provide.

A willing creature that is at least one size larger than
you and that has an appropriate anatomy can serve as a
mount, using the following rules.

Mounting and Dismounting
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Once during your move, you can mount a creature that
is within 5 feet of you or dismount. Doing so costs an
amount of movement equal to half your speed. For
example, if your speed is 30 feet, you must spend 15
feet of movement to mount a horse. Therefore, you can’t
mount it if you don’t have 15 feet of movement left or
if your speed is 0.

If an effect moves your mount against its will while
you’re on it, you must succeed on a DC 10 Dexterity
saving throw or fall off the mount, landing prone in a
space within 5 feet of it. If you're knocked prone while
mounted, you must make the same saving throw.

If your mount is knocked prone, you can use your
reaction to dismount it as it falls and land on your feet.
Otherwise, you are dismounted and fall prone in a
space within 5 feet it.

Controlling a Mount
-------------------

While you're mounted, you have two options. You

can either control the mount or allow it to act
independently. Intelligent creatures, such as dragons,
act independently.

You can control a mount only if it has been trained
to accept a rider. Domesticated horses, donkeys, and
similar creatures are assumed to have such training.
The initiative of a controlled mount changes to match
yours when you mount it. It moves as you direct it, and
it has only three action options: Dash, Disengage, and
Dodge. A controlled mount can move and act even on
the turn that you mount it.

An independent mount retains its place in the
initiative order. Bearing a rider puts no restrictions on
the actions the mount can take, and it moves and acts
as it Wishes. It might flee from combat, rush to attack
and devour a badly injured foe, or otherwise act against
your wishes.

In either case, if the mount provokes an opportunity
attack while you’re on it, the attacker can target you
or the mount.