Did you go speak to Record Keeper? He records all of Maple World's history. The only things he doesn't know are things that have yet to occur. He probably answered all your questions before you even asked. So, what did you say?
#b(I relayed what Record Keeper said.)

Hmm, he must have held back the exact reasons because he is bound not to reveal the secrets of history. But I'm sure he's telling the truth. Then the Goddess' promise isn't the problem...
#bSo what's blocking me then?

You already passed the test. You were given permission. Your oblivion is still intact. The fact that you meet all the qualifications but still can't enter... It means there is an outside force that has infiltrated the temple!
#bForce outside the temple?

An intruder must have gone deep into the temple and put up a force field. That's the only explanation I can think of. What is this intruder planning...? Anyway, the force field needs to be taken down... Oh, you promised to help with this mystery anyway, right?

Bring me 10 , 10 , 10 and 1 each of , and . If I have those ingredients, I should be able to make an item that can destroy any force field.

Please, don't back out on me now. That would be dishonorable.

Did you go speak to Record Keeper? He records all of Maple World's history. The only things he doesn't know are things that have yet to occur. He probably answered all your questions before you even asked. So, what did you say?
#b(I relayed what Record Keeper said.)

Marble of Chaos, which contains the power of confusion, should be able to break the force field.

You didn't get all the ingredients yet? Go to the Priest and Memory Monk Trainee and get 10 , go to the Priest and Qualm Monk Trainee and get 10 , go to the Priest and Oblivion Monk Trainee and get 10 , go to Dodo and get , go to Lilynouch and get , and finally go to Lyka and get . That's what you promised to do, right?