Heirloom Catalyst

• Direct hits with charged shots scorch the target, and Heirloom deals more damage against scorched targets.
• A kill passes scorch on to enemies standing close by, over a bigger area when the victim is a tough combatant or a rival Guardian.
• The catalyst also upgrades the bow to a Masterwork once the unlock objective is met: defeating combatants with Heirloom, with bonus progress for multiple final blows.
• Update 9.7.0 added the Incandescent perk to this catalyst.

Bungie's record for the catalyst says it is acquired from the Equilibrium dungeon, a Renegades dungeon whose triumphs include Finding Balance (complete the dungeon), To Walk Alone (solo without dying) and Listen In (find all collectibles). The dungeon itself pays the Sage Protector armor and seven Legendary weapons, six of them with the Imperial Allegiance origin trait.

• The Heirloom Catalyst on your account.
• Additional Options: Add Catalyst Masterwork. Extras: Self-play (Sherpa).

• The Heirloom bow already acquired on your account.
• Equilibrium unlocked through the Renegades expansion; Destiny 2: The Collection includes it.

Can the catalyst be used without the bow?

No. It goes into the catalyst slot of Heirloom.

Does the masterwork need extra kills?

Yes. The record asks you to defeat combatants with the bow, and the masterwork is the upgrade at the end of that bar.