The Chosen Ones

i got quest elite boss fight and i can't find it , i finished merchant quest and still 2 undiscovered quest... i have already see the maze.. my problem is i can't go through the boss cave.. it's blocked

Okay I got it. Lc-Darkness's 2 undiscovered quests are Strange Stones Quest and Epic Boss Quest. Strange Stones Quest is a bit hard so I will provide the details of the quest here:

Near the Elite Boss Arena you will find an Orange stone, then left click on it to acquire it and begin the Quest. Then travel to the east side of the map and you will encounter a Black stone, acquire it to reveal the Red stone in the top right corner of the map which you will also need to acquire. After that travel to the top left corner of the map and you will find a Blue stone. Acquire it and finally, travel southwards to meet the Mini-Boss, Mielipuoli. Kill him to finish the Quest.

Yes, of course you still can.

About the Elite Quest you will have to travel to the location attached below and kill all enemies there. Then a cinematic will be played and you can start the Quest.

The Stones' locations are shown in the images attached below together with the Boss's location.

It is the Epic Quest you are looking for. Finishing Elite Quest i.e. defeating the Elite Boss will unlock Epic Quest.

What green flash?

I dont get it how you dont see it. Periodically your screen will go green for a bit and then a wisp will appear near you! Anywhere you walk this will occur and you must click on 10 of them?
Disregard the green flash then, literally try this, stand phodom somewhere on the map where you can have a good view of the ground. Wait. Then after 20 seconds or so a wisp should appear near you, click on it fast. Repeat...

Have you met the three Dragon Slayers yet ? Once you have started the Quest green flashes will start appearing.

What is your campaign version, Lc-Darkness ? If it is not 1.6f then it will be a bit more complicated to encounter the Elite Boss.