How the h... am I supposed to get into this place with Darius? I'm in the Soaring tower, and there is this locked door (the forest of knowledge): HOW can I open it? I can find no answer anywhere (and I'm getting rather mad), but I really do not want to go any further (I have already tried an reloaded the game) before I can get inside this place.
PLEASE HELP ME ...

i wish i could help you i'm playing forever kingdom right now and i keep getting stuck. i just got passed this hard boss and got stuck again but i've played evergrace although its been a while. i could try to help you but a lot of the stuff in darius' quest i don't remember. anyway have you tried using magic and stuff? a lot of the time that works and sometimes you just need the right equipment.

All you do is get the Serrated Blade (Leaf Mist ability) And use it on the stone slab that tells you about being able to listen to nature or w/e.

Use your head