The way this Build works is that you'll swap between using the Royal Greatsword and Clayman's Harpoon depending on the circumstances, while Blocking with your Eclipse Greatshield and using Guard Counters for massive damage and Critical Attacks.

Wolf's Assault does devastating damage if you can land the first hit, and the AoE will often one shot groups of enemies, and both of these hits build up Frostbite, though the normal weapon attacks of the Royal Greatsword do not.

You can swap to the Clayman's Harpoon, using the Cold version for better Strength scaling, and to help set the Frostbite status effect more easily. You'll use Ice Spear with it to range enemies when needed, using to Stance Break enemies by filling their stagger meter now and then.

You can buff with Scholar's Shield if you want to equip a staff, which further boosts the Guard Boost and damage negation of your Shield, making you damn near invincible while Blocking. Keep in mind you can use Clayman's Harpoon to Block and attack at the same time, so it's a good strategy against enemies you are having a hard time with.