Your mount can use its reaction to impose drawback on any melee attack directed at you. With Warding Bond, it might improve your AC additional while absorbing half your damage. You can even make use of a reaction to cast Protect for another +5 AC if one thing looks like https://knoxvogwn.liberty-blog.com/28215873/tortle-names-dnd-things-to-know-before-you-buy