To unlock the Arbalest Exotic Kinetic Fusion Rifle in Destiny 2, you’ve to complete the Revelry. The conditions that are required to achieve the Arbalest are that you’ve to earn 300 Reveler’s Essence that will require some grinding from your side.
You’ll acquire mostly all the Reveler’s Essence from the Revelry. While you’ll be in the Verdant Forest, you’ll be fighting against enemies.
You’re given a total of four minutes when you initially start the quest and each time you kill an enemy, you’re given some extra time.
Once you’re out of time, you’re going to fight a boss enemy and when you defeat the boss, you’ll earn the Reveler’s Essence. Bounties from Eva will also grant you with extra Reveler’s Essence.
If you get through all the 20 branches and do not use your Reveler’s Essence in Tonic Buffs, you’ll have more than enough Reveler’s Essence.
Other than that, you’ll also require the Party Hard Triumph. This means that you’ve to at least complete seven out of ten Revelry Triumphs. The Triumphs include:
|Spring Cleaning||Clear 50 branches in the Verdant Forest.|
|Verdant Light||Competitive: Generate 200 Orbs of Light in the Crucible or Gambit.|
|Verdant Light||Generate 200 Orbs of Light in Strikes or Raids.|
|Cooperative||Generate 200 Orbs of Light in the Verdant Forest or in any Black Armory forge.|
|Verdant Light Events||Defeat three bosses in one run of the Verdant Forest.|
|Spring Hunt||Defeat 20 bosses in the Verdant Forest while wearing at least four pieces of the Inaugural Revelry Armor Set.|
|Budding Fashion||Defeat 150 enemies using Super abilities in any activity.|
|Super Celebratory||Land 100 grenade final blows in the Crucible, Gambit, or Strikes.|
|Fireworks||Land 100 melee final blows on enemies in the Verdant Forest, any Black Armory Forge or in Raids.|
|Melee Mayhem||Complete Daily Bounties and Weekly Bounties for Eva Levante during the Revelry.|
|A Bountiful Spring||Clear 50 branches in the Verdant Forest.|
Once you complete seven out of ten of these Triumphs, you’ll complete the Party Hard Triumph and will be able to get the Arbalest. Completing all ten of your Triumph will reward you with a unique emblem.
After you complete your quests, you can go to Eva’s inventory and get the Arbalest.
The uniqueness of Arbalest is that you won’t and can’t use it to just attack enemies without shields as it won’t show you the real purpose it is really used for. The enemies that are there with a shield are the ones that you will enjoy using the Arbalest on.
The Compounding Force of Arbalest shoots out physical slugs that affect the shields of your enemy and the Disruption Break that increases the Kinetic Damage done by the Arbalest.