Vex Mythoclast

• Timeless Mythoclast: full auto fire; when the magazine is emptied, ammo refills based on the shots that landed. Update 9.7.0 gave it a stronger version of Rewind Rounds in full auto.
• Temporal Unlimiter: defeats build Overcharge, and a fully overcharged rifle swaps firing modes for charged linear fusion shots that ignite on precision final blows. The magazine is fully reloaded after leaving that mode.
• Catalyst: in full auto, final blows or rapid hits grant bonus damage, accuracy and stability. The 9.7.0 notes added sustained damage as a trigger and a HUD buff.

The Vault of Glass belongs to Year 4, the Beyond Light era, and Bungie lists it among the raids open to every player. It pays Fatebringer, Hezen Vengeance, Praedyth's Revenge, Corrective Measure, Found Verdict and Vision of Confluence in standard and Timelost versions, the Atheon's Memory armor, and the Exotic ship Vaultstrider. Its triumphs include Flawless Vault of Glass, Master Glasser and Maestro Glasser, and the title is Fatebreaker.

• Vex Mythoclast from the Vault of Glass.
• Catalyst & Masterwork: Catalyst Obtain, Catalyst Masterwork. More Raid Exotics: Collective Obligation, Eyes of Tomorrow, Necrochasm or Conditional Finality. Extras: Self-play (Sherpa).

• The Vault of Glass, which is open to every player. A raid fireteam of up to six players.

Is the catalyst needed for full auto?

No. Full auto is part of the intrinsic; the catalyst adds the bonus damage, accuracy and stability.

Did Update 9.7.0 change the rifle?

Yes. Its Rewind Rounds equivalent, the ignition on linear shots, the reload after leaving linear mode and the catalyst triggers were all adjusted.