Think I broke the game..

This one is bugged you need to use the potion to defeat the end boss but if you don't have the potion at that level there's no way you can at min
damage. So in advance I warn you fight the boss in a party the first time
or solo then die and have to wait for a bug fix or act of god... By the way
if anyone gets the potion let me know because I fell victim to the bug.

you know you play with an incomplete english patch.. turn it off to do the quest.

Yeah but the quest text worked before ;)

the very same text sure didnt work before either unless you changed patches

Okay here's the glitch you need a potion to defeat the slime monster which
you use in combat. After the combat occurs it goes away, never to been seen again. You can't go back to the guy and get another one. Obviously I lost the combat and the potion when I died. Also you can't pass and repeat the quest because it's a required quest. So what the hell, am I going to do? Wait till level 20+ then complete the quest doing only minimum damage to it! This is a serious bug if anyone knows how to solve it they earn a 1000 thanks..

Lv 16 quest in Vel

They did a huge patch so they maight have changed that part of the quest, so the English patch doesn't contain it.

huh you mean the v1.0 update? that wasnt huge at all Oo

If you lost the potions, get a tank, healer, and ranger. The ranger is able to use his poison trap on the Slacy and it goes through the damage shield. Tank and healer just to keep you alive while the poison trap eats away the Slacy. :)

okay found a really far away solution... going to level by doing all the other missions I can
. Then use divine power before it can put up it's barrier and jump on it for the remaining life force.

Or you do like I did: lv up until lv 16 (minimum lv requirement) and get a party going to kill the slime.

Once its dead the ghost will appear and you can talk to it and get the quest done.