So, if you were a celestial paladin type, how would you generate enough damage to slay a archduke of hell in two strokes or less? Say maybe 25HD equivalent or so per blow, so 200hp let's say. With a last-published crit range of 15-20, we can probably say one is a crit I guess, so maybe only 120hp per blow.
Weapon of 6 for the d10, +8 for enhancement, another +8 for fiendbane. Smite for +20 or so. Strength of what, 44 with Strength domain power and belt, for a nice +17. That's 59 as a primitive starter.