: The skulls can't be mortar rounds. The skulls are powered
: by a mana bar on the krid giants (this means that they
: are magical). And the skulls are skulls. Mortar rounds
: are not skulls. There is a large difference between a
: bone structure and ball of metal and gun powder.
I assumed they were ordinary, nonmagical skulls (actually, they look more like dried-out whole heads) filled with some sort of explosive mixture. From a krid's point of view, why waste time fashioning a metal container for your explosives when there's a handy container atop the shoulders of each of your victims? As for the mana bar, I have the feeling its purpose is mainly functional--if the giant didn't run out of mana after one throw, it would keep on throwing instead of attacking hand-to-hand, and that's just not the attack behavior Bungie wanted.
