Board Thread:Question and Answer/@comment-25988672-20150217091014/@comment-25000380-20150217235834

I believe Shirone is correct, haven't tried by myself but other players around the wikia have attested that Skill unleashes doesn't work on maidens with the same skill, some even say that if you have 4 Sulis and a X card, every Sulis proc would trigger the X card skill, but haven't tested by myself tho.