When u reach the Combat Isle in WA 1, Go down the stairs where all those monsters are been captive. There is this green one that keeps blocking a door, and he answers to the tear drop!!! Does anybody knows about that?

You can only fight in the arena after you recover the tear drop and pass through gate generator and the events after that. The tear drop is vital for the game and if you miss it, the only solution is start a new game. A hint: the tear drop tool can be recover in the photosphere after upgrade the earth golem in court seim.

But what about the green monster downstairs? He keeps blocking the door even with the tear drop... I wonder if anyone already got to past it.

Well, I don't particularly remember, been a long time since I played 1 that far, as it freezes on me. But try hitting him with a nice rod to hear his wise words. They may help out, not sure.