Masterfeats.2da

The   file is the .2da that defines groupings of feats that are treated as one when they are displayed for selection during level-up (and character creation). They tend to differ in some specialization, such as skill focus being a grouping of feats and skill focus (heal) being a specialization of that grouping. After a player selects one of these "master" feats, a specialized sub-feat is then chosen from a pop-up window. The information in this .2da generally only affects level-up, as at other times it would be the information about the sub-feats that is used.

Master feats themselves do not have prerequisites. Instead, a master feat becomes available as an option if the prerequisites of any of its sub-feats are met. Essentially, master feats are merely presentational, reducing what would otherwise be clutter in the feat selection window.