Unstoppable thirst of power

Is black spirit quest unstoppable thirst of power, worth doing ?

 

I suppose this is the questline you are referring to?
https://bdocodex.com/us/quest/738/1/

Well, I am not you, and I am pretty sure that NO other player is you, so it is really up to you whether you think that the reward is worth it or not.
I mean at the very least you Could try it, and test the reward out for yourself, in comparison to another accessory of course.

You simply HAVE to keep in mind that you are the one playing the game, not someone else, so for good or bad, sometimes you just have to find things out for yourself

 

get lvl 58, do kamasylv1 questline till second mirumok quest (only talking etc) and then u can do valtarra quest (2man+ fighting quest).
Id takes around 10 mins to complete it, and if u pop at least a 600%exp scroll (alchemie 3x 200% scrolls) + 200% (blessed scroll) + 100%book + 100%bell or something else, you should get to 64 in one go.
But u have to use the exp scrolls before u end the quest.
Edit: Forgot to say why you should do it. xD
Google Capotia acessories. These u can get for reaching lvl 64. 1 per level from 61 till 64. And u can then craft another ring and earring through jonas fragments what costs you around 350mil per item to reach tri crescent stats (tri crescent right now is aoround 1.4bil if im correct).