Ice Breaker Boost

• The base order: Vesper's Host clears on your account until Ice Breaker drops.
• Add Catalyst: the catalyst is collected too; the game says it comes from solving Clovis's secret in the dungeon.
• Add Catalyst + Masterwork: the catalyst record is completed as well, so the rifle is upgraded to a Masterwork.
• Self-play (Sherpa): you play the runs together with the team.

A booster usually starts within about 30 minutes. The finish time is flexible, since an Exotic drop takes an unknown number of clears and the catalyst brings its own steps.

No Backpack, the intrinsic perk, gives final blows and assists with any other weapon or ability a chance to generate Ice Breaker ammo, and defeating powerful enemies yields several rounds at once. Its trait, also named Ice Breaker, makes a defeated target explode; a precision final blow or shattering a frozen target sets off an ignition instead. The barrel (Corkscrew Rifling), the magazine (Accurized Rounds) and the stock (Composite Stock) are fixed on the rifle and are not part of the order.

• The Final Shape Dungeon Key, because the rifle drops in Vesper's Host. All Dungeon Keys are in Destiny 2: The Collection or sold in Eververse.
• For either catalyst extra: the Rogue Network quest completed on the account, which the service asks for.

What does the catalyst ask for?

Its record reads: defeat targets with Ice Breaker and solve puzzles in Vesper's Host. The Masterwork extra covers both parts.

Where does Ice Breaker drop today?

In Vesper's Host, which Bungie still lists among the available dungeons; the Collections entry of the rifle names the dungeon as its source.