Board Thread:Questions and Answers/@comment-153.185.185.221-20130922161306/@comment-9505008-20130922210814

All buffs/debuffs are done additively, meaning if both Gregory and GGB proc, your total attacks will increase by 20% + 15% = 35%. In this case, it would be 0.35 * 50000 = 17500, meaning your final attack will be 67500.

Leader advantage will activate if your Lead Daemon's type is advantageous to your opponent's Lead Daemon/WG/GG. Regardless of your team composition, having a leader that has advantageous spec will give your total attack 15% boost. If you have daemons that is the same type as the Leader, then there will be additional 1.2% boost, per daemon, to the team's total attack. This means that a pure Divina team facing off against Phantom Daemon would receive 20% attack buff.