The different Whetblades and the type of Ash of War determine what you can use for the Affinity. Usually anything Elemental/Magic/Status Effect Ash of War only lets you Switch between the Effect Type and the 4 Physical Types. For Example a Fire Ash of War can use Standard, Heavy, Keen, Quality, Fire and Flame. Magic is Magic and Cold + the 4 Phys. Blood is Occult/Blood/Poison and the 4, ect ect. BUT a Physical only Ash of War can use any affinity type as long as you have the Corresponding Whetblade. Want a Blood Unsheathe just need the Black Whetblade, Holy...Sanctified Whetblade, Magic....Glintstone Whetblade, Flame...Red-Hot Glintstone, ect ect.