I dont even know where to begin.

Guardian 61 248/253/316, Cleansing Flame + God Incinerator, both enhanced to leech HP and SP on hit.

I had some problem killing Garmoth during main quest, but I did it without dying.

I died 3 times already on this fox boss and I'm not dying again.

This boss is terrible.

I jumps away at EXACT moment I try to use skill, out from my AoE reach.

Then it jumps back, behind me, and AoE CC's me.

This happens constantly, I can barely hit it, and when it happens I guess it's pure luck on my side.

Is this some AI-driven mechanics? Does the game somehow listens to my key presses, then moves the boss away?

What is this SCREEN-WIDE permanent AoE that thrashes me around, I cant attack or block.

Whats that constantly-respawning small foxes, there are like 20 of them, no matter how many I kill, they keep respawning.

This is only level 1, and there are 7 levels of this boss 'difficulty', right?

How it is even possible to kill it, why it is so hard?

I'm not doing it, and I'm outta this LOLM expansion, forever, I dont need any rewards, energy, knowledge, I dont care.

Look, I only have 1 life and my time is somewhat limited. I enter this game to have fun and relax, but I dont remember last time I had fun. I constantly receive absolutely irrelevant flashy popups into my face with information I dont need and never requested: papua Crine war (dead content, there's nobody there), Whale, Rhino, Dawn Grudges, they said the will add option to disable it but they did not. Everything takes forever to achieve, I'm playing 2 years already and look at my GS, I didnt even begin to progress, I work my a** off gathering and farming several times per day but I'm still dirt poor.

And now this fox boss practically raping me several times and mocks me afterwards.

Why it is harder than BIG DRAGON GARMOTH?

Look, I want piece of mind and relax, to forget about real life hardships for a while, I dont want to step out of my desk after 2 hours fighting 'a boss' with my sweaty hands shaking and break my keyboard, with zero result.

This whole expansion is terrible, and this game goes wrong way. I dont believe all annoyances and complains will even be fixed.

Try to have fun, everybody. The chat is best part of this game, and PA does not deserve a community like this.

Goodbye.

Since you said you tried level 1, I think you are not talikng about the main quest, am I right?

If so, your AP/DP are only 10%! The rest needs to be done through the Auras you can set in the black shrine window.

Also you should read this guide (this also helps with the quest boss):
https://www.blackdesertfoundry.com/boss-rush-black-shrine-guide/#Gumiho

Also, not trying after 3 deaths is a weak mentality. I will assure you that at c6 and c7 all you will doing is dying. I spent 6 hours dying before clearing a c6 songakshi. 

I died to c4 gumiho(missing orbs while questing) for at least 4hours before figuring out the timing with blue flames. The blue gourd only works twice, so timing is important. 

EDIT: As a guardian, switch to pre awake for movement skills. W+Q to jump behind the fox when she is prep for a fire breath works really well. Be mindful of stamina. Stay clear off circling AoE. Know that skills that can stun or stiff.. Sometime you need those to prevent one shot mechanics. Get more orbs. 

I agree, after gentle playing  with a seasonal character combined with the pleasure of discovering new areas, I decided to go through the same with the main character, it's a real horror, I chose the boss fight without thinking, now you can't go back, you can't start something else, after a few I'm fed up with deaths, I don't enjoy this game, it's time to permanently move out of this area. I don't need advice on how to practice to survive, how to develop a color bottle strategy, I'm just expressing my opinion and my feeling about the game.