Defeat combatants in Nightfalls and the Guardian Games Competitive mode. Higher difficulty Nightfalls grant more progress. Completing Nightfalls with fewer deaths grants increased progress. Guardian Games Competitive mode and Legend difficulty or higher Nightfalls grant the most efficient progress.
Defeat combatants in Nightfalls or Expert Rushdown. Higher difficulty Nightfalls grant more progress.
Completing Nightfalls or Expert Rushdown with fewer deaths grants increased progress.