Talk:Stack Defense/@comment-37275580-20191006174856/@comment-32271305-20191006215455

At the top of this page ("Basics" section) there's a list of how the game calculates damage output. Each row has its own boost, and all boosts that belong to one row are cumulative to each other.

The same concept can be applied to DEF buffs, SA boosts for example belong to just one row and therefore they're always cumulative, while Passive Skills have two different rows available, so there's a maximum of two multiplications available instead of just one.