How to get Ni Runes Fast(Plz help)

I need some grind spots to get ni runes. Ive searched lexdale and got 1 in 15 mins. If you got any good grind spots for Ni Runes plz tell me the cords

 

Sigh... this is my little secret but I wander around the entire house of taylor (church next to lexdale) and Nii guardians spawn there around every 15 min if you walk out of the place every now and then, reload the chunks, and come back.

It’s a slow but rewarding process.

 

If you find one Nii rune guardian, stay near where you found it and more should eventually appear

 

I will never understand why Nii runes are so hard to farm considering they are supposed to be the lowest tier needed for corrupted dungeons.

 

I got to the Light Forest to find Nii Guardians.
Usually around the south side of the Forgery but I once found like, four Nii guardians at once in the same spot near the canyon in the Light Forest.

 

My preferred spot is precisely here. Nii Guardians (and rare mobs in general, I believe) spawn at random times in specific locations, not in random locations in general areas. The best farming spot would thus be one that has a bunch of spawning locations close together, which this part of the CotL has:
One next to the wooden barricade near the path:

Spoiler: Guardian

one on the zig-zag path to the Harpy nest:

Spoiler: Guardian

one next to the path to the Harpy nest:

Spoiler: Guardian

one around the path between Ranol's farm and the big crystals:

Spoiler: Guardian

and one around the crossroads at the uphill path to Eltom:

Spoiler: Guardian

I'm not 100% certain this is how rare mob spawning works, but evidence suggests they do only spawn in very specific spots. That would explain why you might occasionally find two Guardians right next to each other.

Spoiler: Buddies! :)

(As a bonus, there's also a Suspicious Crate that spawns on the hill.)