Ok, understood. What comes to paladin of slaugther vs blackguard then paladin of slaugther gets suckier aura ability (-1 to AC) while blackguard or paladin of tyranny gets -2 to all saves (which is lot better).<br/><br/>Paladin of slaugther/tyranny though gets overall better spell list than blackguard, but in turn blackguard stands well alone as it provides sneak attacks progression, mount which abilities depend on your HD than class levels.