Mounted Combatant for Horizon Walkers

You are a dangerous foe to face while mounted. While you are mounted and aren't incapacitated, you gain the following benefits:

• You can teleport with your mount if you use any teleportation magic (Misty step, Distant Strike, Ethereal Step ext.)
• You can force an attack targeted at your mount to target you instead.
• If your mount is subjected to an effect that allows it to make a Dexterity saving throw to take only half damage, it instead takes no damage if it succeeds on the saving throw, and only half damage if it fails.