Advice about damage

Guardian is based on HP/ATK (More of Hp). you can get the skill at lv 160 xD You have multiple builds you could go for actual damage
VIT/DEX/STR VIT/INT/STR or VIT/DEX/INT all 3 of those are the guardian spam builds, the others, could be berserk style purely with VIT/INT/CRT or VIT/STR/CRT or VIT/DEX/CRT, it just depends on what you consider to be better damage wise, but IMO I think you'll benefit more going Guardian spam build in the long run ^^)/ good luck in deciding what build you'd like to do for your to be pally xD