I got Garmoth Knowledge by doing "About the crimson Dragon Garmoth" quest. but the knowledge grade was C. so i deleted the knowledge thinking that i can re-obtain it again like other world bosses but i couldn't. The quest only done Once per family.

All other world bosses knowledge can be re-obtained through npc by using amity except Garmoth.

It dosent makes any sense to not let us re-obtain or getting knowledge on the most important world boss. I been trying to do the last hit on Garmoth boss in the past 6 months and still cannot get the knowledge again.

PA please do something about it

A few years ago during a ball, a kr player asked them to add a way to obtain garmoth knowledge (because of the problem you show above known by all players since the existence of garmoth), unfortunately the devs did not understand his request and replied that they appreciated the efforts of the players to hunt blabla knowledge and that he could obtain it by doing a quest in drieghan...

A few years later, the devs are still unaware that you can't do this quest again to get this knowledge....
If only they really played the game like they said during another ball...

I don't understand how someone could downvote OP. This is practically a bugfix request. If what OP says is true than this is obviously oversight by the devs.

It's most definitely true. The info in the boss discord even warns about it.

Now, as to whether it's an oversight be the devs, I don't know. It's not uncommon for them to make something harder, rarer, or way more of a pain than most of us think should be the case. I do agree that it was a poor choice on their part though.

This is not fair for players who their goal is to have all mobs Knowledge at "S"

We request to do something about it so we can get the knowledge back.

how we are supposed to do the last hit in  millions of players? I am trying for more than a year to get it and still nothing. I hope devs do something about it.

Any new about this suggestion? I have a friend, since the release of garmoth he still doesn't have the knowledge, he deleted it from the first day thinking he could redo the quest to get it again, as is already the case for all other world bosses, except that, as we have already reported it for years, it is impossible to redo it..

I was trying to get garmoth knowledge to more than a C, i read the way to reset bosses knowledge, prepared a lot, then the moment i deleted i tried to get it again and then i find i can't get it again, out of all the bosses ever there, there's a knowledge i'll have forever lost until they decide to do something about it, all the boss knowledge guides should say "Oh and do not try this with garmoth, you will never get it back"

I hope somehow we can make PA notice this issue and address it properly 

+1 Garmy knowledge fix is a must. Most likely something they never noticed. Hope this thread gets the attention it deserves. I'm also stuck with C grade knowledge.

Hello, french player here. I love to get all my knowledge to S rank. I originally got Garmoth an A+ rank. Wasn t satisfied.

I reset the knowledge like i m used to.

Now i m not satisfied AND not happy cuz i got screwed.

Thx Pearl Abyss, please fix this. I'd like to see garmoth's HP ( and her heart as well would be nice )