What is the mechanic of the poison resistance ?

fxeconomisteb17_ESO

Is there a way to completely nullify the poisoning effect ?

paulsimonps

No, you can only get it down to a max of 50% mitigation of poison.

Here is a for version of why and all other forms of mitigation:

https://forums.elderscrollsonline.com/en/discussion/279426/damage-mitigation-explanation-and-list-of-options/p1

If you want you can just Ctrl+F and search for the bit about poison and such.

fxeconomisteb17_ESO

I actually wanted to get rid not of the damage itself, but the health regen reduction effect.