Does Arbalest Have a Catalyst?

Upgrades this weapon to a Masterwork. It will generate Orbs after rapidly defeating targets and gain a tracker that displays the number of targets defeated with it. Defeat targets using this weapon to unlock this upgrade. ...

Is there a catalyst for leviathans breath?

The Leviathan's Breath Catalyst has a chance to drop whenever the player kills a powerful enemy. Powerful enemies are essentially anything with an orange or yellow bar. There's no indication that any specific powerful enemies will have a higher likelihood of dropping the Leviathan's Breath Catalyst.

Does Thorn have a catalyst?

Thorn needs no catalyst, aside from orbs and a kill tracker.