The hash identifier of this activity variant. Examine the activity's definition in the Manifest database to determine what makes it a distinct variant. Usually it will be difficulty level or whether or not it is a guided game variant of the activity, but theoretically it could be distinguished in any arbitrary way.
The hash identifier of the most specific Activity Mode under which this activity is played. This is useful for situations where the activity in question is - for instance - a PVP map, but it's not clear what mode the PVP map is being played under. If it's a playlist, this will be less specific: but hopefully useful in some way.
Mapped to DestinyActivityModeDefinition in the manifest.
The enumeration equivalent of the most specific Activity Mode under which this activity is played.
Represents a variant of an activity that's relevant to a milestone.