Artifact mods in Destiny 2 are currently being duplicated and stacked for significantly increased damage numbers. Players can select one of the seven available Artifacts in the game, and stack the same perk on a single artifact for all seven slots. This leads to a perk, such as Pack Tactics from the Implement of Curiosity Artifact, to deal seven times more damage with Threadlings than usual.
This article breaks down the process to duplicating your Artifact mods for increased damage output, or survivability, depending on the mod you want to stack.
Duplicating Artifact mods in Destiny 2
To duplicate Artifact mods, start by launching any activity that locks your Artifact. For example, we will go with the competitive PvP activity in the Crucible. You can do this in Trials of Osiris on weekends as well, upon purchasing a Passage from Saint-14.

Once you launch the activity, you will then be in matchmaking mode, where the game finds some more players for you.
After all six players are in a lobby, you will be then placed in a loading screen. You will know you’re in a loading screen once the texts on screen, alongside the player counter for matchmaking, goes away.
When your match is loading, open your inventory, followed by your equipped Artifact, and then click on each empty slot. Next, choose one perk that is present for all seven slots, and equip it for all the slots.
Once done, simply exit from your character via the “Change character” menu, and load back in.
Avoid making another loadout with the same Artifact that has the seven mods stacked. Doing so will unequip the seven mods from all slots, requiring you to do the entire process once more.

Note that only the Artifact perk that is available in all seven slots can be equipped via this process.
Since the Pack Tactics perk we have used as an example is present in all seven slots of the Implement of Curiosity Artifact, it can be equipped in all of the slots.
However, such is not the case for mods like Particle Reconstruction in the Tablet of Ruin Artifact. This is because the perk is present only in the last two slots out of seven, allowing it to be duplicated twice, instead of seven times.
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Edited by Soumyadeep Banerjee