About Crusader.

[Sodo]

Actually the calculation (as seen in the game) is:
(500% * (ATK+MATK) *holy damage)

Or something like that...I know now that the angeling remove the received damage but doesn't nullify the 20% damage that can't be removed with anything.

But I was wondering why would ATK (which involves STR+Weapon) be useless? It seems to me that a 500atk + 500MATK grandcross would be very strong no?

But building STR instead of DEX would cause for a very slow cast time, and you want to be able to pull off a fast Grand Cross. DEX increases ATK also, but only the minimum, not the maximum.