Learn how to get the Xenophage Catalyst in Destiny 2 by farming Zulmak in Pit of Heresy, what the catalyst adds, and which mistakes to avoid.
The Xenophage Catalyst is a random drop from the final boss (Zulmak) of the Pit of Heresy dungeon on the Moon — there’s no vendor, currency, or Monument of Triumph node to buy it from, so you farm that last encounter until it drops.
If you’ve picked Xenophage back up for the Monument of Triumph catalyst chase, there’s no clever shortcut here — the catalyst is pure RNG off one specific encounter. The upside is you don’t have to grind a whole dungeon to chase it. Below is exactly where it comes from, how to clear the fight that drops it, and what it actually does once it’s on the gun.
Where the Xenophage Catalyst drops from
The catalyst comes from the final boss of the Pit of Heresy dungeon on the Moon — Zulmak, Instrument of Torment. That last encounter is the only place it can drop, which is good news for your time: you don’t need a full clear every attempt. Once the dungeon is unlocked, you can reset straight to the final fight and farm Zulmak on repeat.
There’s nothing to buy. It costs no Glimmer, no Exotic Cipher, and no Spoils of Conquest, and it isn’t tucked behind a Monument of Triumph kiosk or the Legendary/Exotic Order systems that hand out a lot of the other new catalysts. It simply drops — or doesn’t — when you finish the encounter. One thing to get straight first: you need to already own Xenophage for the catalyst to mean anything, since all it does is upgrade a gun you have.
Skip the full dungeon and farm only the final boss — Zulmak is the single encounter that can drop the catalyst, so reset straight to him each run.
What you need first
How to beat the Pit of Heresy final boss for the catalyst
STEP 1/13
Kill the sword bearer
Take out the sword-bearing Knight that spawns in so it drops its blade.
STEP 2/13
Pick up the dropped sword
Grab the sword — it’s the only weapon that damages the three mini-bosses around the arena.
STEP 3/13
Read the three positions
The middle is the shrieker, the left is the knight, and the right is the wizard.
STEP 4/13
Deflect the shrieker’s shots
Block its projectiles straight back at the middle shrieker until it goes down.
STEP 5/13
Grab the orb it drops
The shrieker leaves an orb behind — pick it up before it disappears.
STEP 6/13
Dunk the orb
Carry it to the receptacle and dunk it to bank that first clear.
STEP 7/13
Move to the knight on the left
Grab a fresh sword and start working the left-side knight down.
STEP 8/13
Damage adds with the sword light attack only
These three only take damage from the sword’s light attack, so charge your super and pop it to clear them faster.
STEP 9/13
Bank the next charge
When the knight dies, grab the void charge it drops and dunk it.
STEP 10/13
Repeat on the wizard
Grab a sword again and bring down the right-side wizard the same way.
STEP 11/13
Dunk to start the damage phase
The final dunk after all three are cleared triggers Zulmak’s damage phase.
STEP 12/13
Burn Zulmak down
Stack a debuff like Tractor Cannon plus damage supers — he doesn’t have much health, and just watch for the Solar floor.
STEP 13/13
Check for the drop
Each completed clear rolls a chance for the Xenophage Catalyst, so finish and check, then reset if it doesn’t appear.
Video help
What the catalyst adds to Xenophage
Once it drops and you charge it, the catalyst stacks two perks onto the gun. Rampage grants increased damage on kills and stacks up to three times, for up to roughly 33% more damage at full stacks. Chain Reaction makes each final blow create an elemental damage explosion, which turns Xenophage into a genuine add-clear tool on top of its boss-DPS reputation.
| Detail | Value |
|---|---|
| Source | Pit of Heresy final boss (Zulmak) |
| Cost | None — random drop |
| Difficulty | Normal is fine |
| Perks added | Rampage + Chain Reaction |
| Drop type | Random chance per completion |
One number to treat with caution: how many kills (or what objective) it takes to fully charge the catalyst after it drops isn’t published by Bungie, and the community figures floating around aren’t consistent with each other. Plan to play with it normally and let it tick up rather than chasing a confirmed count, because there isn’t a reliable one yet.
Mistakes players make chasing this catalyst
The biggest one is expecting a guaranteed drop on your first clear. It’s a chance each time the encounter is completed, not a fixed reward. Early players report a fairly generous drop rate — one reported run saw it after about four boss kills — but those are anecdotal numbers, and at least one community post quietly walked its claim back from “guaranteed” to “not actually guaranteed.” Treat it as RNG and you won’t be disappointed.
The other common trap is farming it in the wrong place. A lot of the new Monument of Triumph catalysts come from Vanguard, Crucible, and Gambit “Ops” playlists or from the Legendary/Exotic Order payouts, so it’s easy to assume Xenophage works the same way. It doesn’t — Xenophage is specifically a Pit of Heresy drop. There’s also no Monument of Triumph vendor or kiosk that sells it, so don’t go hunting for a purchase option that doesn’t exist.
Finally, re-running the original Xenophage weapon quest does nothing for the catalyst. That quest exists to get you the gun; the catalyst is a separate RNG drop that only comes from running the dungeon’s final fight after you already own the weapon.
Grinds worth doing next
If you don’t actually have Xenophage yet, that’s the first detour — it’s still obtained in 2026 through its Moon quest chain (the Hive statue puzzle in Sorrow’s Harbor, the light relay in Anchor of Light, the four Lost Sector rune puzzles, and the secret Volmar fight inside Pit of Heresy). From there, it’s worth learning to farm the Pit of Heresy final boss efficiently so each catalyst attempt is quick, and deciding which of the 26 new Monument of Triumph catalysts are worth your time first. If you do land this one, Chain Reaction pairs naturally with a Solar add-clear build built around rapid multi-kills — exact loadouts are still community theorycraft, but that’s the direction most setups lean.
Frequently Asked Questions
Do I need a full Pit of Heresy run, or can I just farm the final boss?
You can farm just the final boss. Zulmak is the only encounter that can drop the catalyst, so once the dungeon is unlocked you can reset to that fight and repeat it without clearing everything else.
Is the Xenophage Catalyst drop guaranteed?
No. It’s a random chance on each completed encounter. Some players get it within a few runs, but it is not guaranteed on a first clear, and the official drop rate isn’t disclosed.
Do I need Legend or Master difficulty for the catalyst?
No — Normal difficulty is enough. There’s no higher-difficulty requirement to make the catalyst eligible to drop.
Can I buy the catalyst from a vendor or the Monument of Triumph?
No. There’s no vendor, kiosk, or currency cost, and the Monument of Triumph is the update framework, not a shop. It only comes from the dungeon’s final encounter.
Do I need to already own Xenophage to get the catalyst?
Effectively yes — the catalyst upgrades the gun, so it’s only useful if you already own Xenophage. Chase the weapon’s Moon quest first if you don’t have it.
