Originally posted by [b]Chilly[/b]
http://www.eathena.ws/board/index.php?autocom=bugtracker&showbug=4338
currently you can increase the damage of spiral pierce with cards like hydra, abyss knight, etc. on kro when i tested with these cards i got no increase in damage at all. the only cards that should increase its damage are atk/str increasing cards and archer skeleton card.
http://forums.irowiki.org/showthread.php?t=44264&page=54