Key Guardian Grinding Spots

Where are appropriate places to grind key guardians for their keys (and Nii Guardians too!)?
Thanks.

 

I find a ton of nii guardians near the forgery, in the dark forest, and in the light forest
Corrupted Sewers spawn in the dark forest
Corrupted Sanc spawns in CoTL
Same for CSST guardians
Infested pit spawns in light forest
Idk about the rest
Also for Uth runes Avias spawn in very specific places, I find a ton in front of fallen factory my strat is to just /class until one spawns

 

Personally, I find a lot of Avias in the coords shown in this thread:
https://forums.wynncraft.com/threads/new-dcave.185197/

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Also, it was just one. And it was the one I need to find the most.

 

Are you talking about Corrupted Underworld Crypt?
You can find them in CoTL, too. I happen to find most on the Cinfras County-CoTL transition (close to old ??? meteor).

 

I find a lot of Corrupted Infested Pit guardians right in front of Cinfras. I also find Nii Guardians surrounding Lexdale.

 

I found at least 12 fallen factory key guardians in the Molten Heights while using my archer and assassin to grind there so fallen factory key guardians are quite common there

 

They're more common in Corkus.