The BY FAR rarest Buff in Elden Ring

With the Shadow of the Erdtree DLC not far from now it would be a good time to look at the rarest thing in Elden Ring which also happens to be the least understood and most secretive mechanic.
Did you know about the feversoul mechanic?

If you want to try it out yourself:
https://www.nexusmods.com/eldenring/mods/3232/?tab=description

Music used:
Qumu: Luigi’s Mansion 2 Dark Moon – Gloomy Manor [Remix]

Timestamps:
0:00 The secret Mechanic
0:08 Myths
0:37 Feversoul
0:54 Limitations
1:08 Exceptions
1:43 Secret
2:18 Best Rune Farm

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