Nice build! What stats is required to use the blood build on this weapon? I can only add poison etc no blood alternative when i pick up excact same ashes of war as you. Lvl 177, 65 vigor, 65 strenght, 45 stamina and only 16 on the rest stats, i think the problem can be with too low arcane but the ashes or war does not tell me any required stats?
For Radahn you are better off with a fully upgraded finger shield and a spear stab weapon, he is too aggro to land hits with that especially in phase 2.