What’s the most common monster element-type at endgame?
I hear people saying that there are many earth type mobs for the current end game zones.
Ooh I see. Why do people generally say to aim for holy / dark property attack?
Those are tipically the best properties in the game.
No element has resistance against those (aside from themselves) and they are weak to each other (Holy <-> Dark), so they are very safe picks.
Most magic type mob in the new content if i am not mistaken are darkness element.
Melee/physical ranged change from earth and poison as being the most in the areas, of course there are some mixed ones in there, but the 3 elements are the most found if memory serves me right.
And as @Anarth said, Holy and Dark are some good choices, well, pending more to Holy damage i think.