Board Thread:LOC General Discussion/@comment-6053607-20130128172607/@comment-5706972-20130201032614

In summary:

Battle vs another player: One round of attack

Skills stack, same skills can activate, up to 3 skills total will activate (between 0-3)

Battle vs Raid Boss: Five rounds of attack

Skills do NOT stack, only one skill will activate per round, ONLY Raid boss skills will activate, up to 3 skills total will activate TOTAL (between 0-3, at most 1 per round)