Argon Crystal in Warframe is a rare resource, and unlike any other rare resource, it decays every day until your whole hard-earned stacks are gone (no pun intended). With a limited shelf-life, Argon Crystals are something that every player has to periodically farm for since it is a required resource for crafting a variety of Warframe parts, weapons, cosmetics, or other enhancements.
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How Do I Farm Argon Crystals in Warframe?
Location
Void missions in Warframe are your best bet for farming Argon Crystals. Now, two types of runs are best suited for the purpose and it depends completely on your preference and the Warframes you have in your arsenal.
Ani and Mot (Void Survival missions)
If you want to go with a full squad and farm Argon Crystals for an extended amount of time, the Ani and Mot nodes are your go-tos. For this, you optimally need a Nekros with Desecrate and a Khora with Pilfering Strangledome. A Smeeta Kavat with the Charm mod can also help tremendously, although the timing of the buff depends on your luck.
Ideally, you should find a suitable dead end on the tileset and kill enemies as they come in a chokepoint. After spending a good 20 to 40 minutes doing this, you should amass enough Argon Crystals.
Also Read: How to Get Nitain Extract in Warframe
Teshub, Stribog, Oxomoco, and Marduk (Void Exterminate and Sabotage missions)
These are best suited for solo players. To maximize farming Argon Crystals in these missions, you need a frame like Xaku or Limbo modded for maximum range and efficiency. Having the Loot Detector aura mod on your frame and the Animal Instinct mod on your pet can help you locate all the containers scattered throughout the tileset.
Once in the mission, you should explore the whole tileset as you do the objective, and keep spamming your cheap max range nukes (Cataclysm for Limbo, The Vast Untime for Xaku) to break all the storage containers for loot. This is, in my opinion, the more fun way of farming Argon Crystals in Warframe.
Timing
You have to keep in mind the decaying nature of the resource. So, there is no point in farming more Argon Crystals than you need for your immediate crafting needs.
What I usually do is– I farm Argon Crystal at the very end after amassing all the other required resources for any blueprint in my Foundry. This ensures I am not wasting my time farming a resource that will vanish into thin air bit by bit.