Dive doesn't scale off of agility and its mostly enough for combat movement, and the flutes/mounts are good for overworld mobility, so I don't see the movement being a problem
Blood chalice is a thing that can be used if you are going for a actual tank build but this is supposed to be a max defense build and haunted scythe is viable
why megaton pendant? titan brace is a thing would've been better if you used snow wanderer for -20% damage and malady medal with aced fearmonger for whole -30% damage then juggernaut, idol of solitude on top of all of that, AND elite shield. and you will STILL, have 10 agility