i just got into crimson fields, and got a quest called "defeat war oni in crimson fields". i follow my quest arrow, and it takes me to this building. but the problem is it won't let me in. >_> any help?
You have to do other quest. Press "q" button and you will see the other quest. You will have to do it and summon wavebringer. When you summon him, you'll need to kill him and then you will be able to get in building and kill war oni.