ok yes u can ill send u and invite and the way u do that is the stronger person will begin the attack then u go to the historical boss maeda keiji nene......

ok assassination is the way u kill other ninjas in the game the only way to get the ninjas on ur assassination list is to do missions when u do missions and complete it the others that that complete the same mission u will get them on ur list the same goes for u to get the person on ur list u have a 5 min duration to get them ok

your welcome

ok here are answers for 1) no. 2) two not exactly but it will help u with missions and if u are attacked till u can buy better ones. 3) oh and not exactly the purpose of a group is to help u do historical quest in a more cooperative and quicker way other than training for hours to get strong enough to get the weapons they hold from each boss and the way u join one is in the alliance panel to the lower right of the screen u can ask someone to send u an invite to there group and accept it there u can make ur own and get people to join which i advise against ok. hope that answers ur questions