Heroic Strike Modifier Breakdown (Destiny)
Bungie updated the 2.3.0 Patchnotes:
Strikes - Updated 6/20/16 to add missing notes
-Heroic Strikes now include a randomly-selected group of three modifiers
-One modifier will be applied from each of the following lists:
- Group 1: Small Arms; Specialist; Brawler; Catapult
- Group 2: Airborne; Solar Burn; Arc Burn; Void Burn
- Group 3: Juggler; Fresh Troops; Ironclad; Exposure; Chaff; Berserk
-Trickle will not be applied to Heroic Strikes
So, two buff modifiers and 1 debuff modifier.