The second passage cannot be used anymore. The third door is open. Distract the monsters in the 追跡者の陣1. Let's see... 160 エルダーレイス and 魔族追跡者 monsters should be enough this time. You need a little challenge.
「はい」の返答
Your deeds will be repaid someday!
(Take the third door to the 追跡者の陣1 and hunt down 160 エルダーレイス and 魔族追跡者 monsters.)
「いいえ」の返答
You're giving up NOW? You're a monster.
クエスト報告時
Are you done?
「はい」の返答
Why are you giving me the stink eye? It's not my fault the missions are getting harder. Anyway, the third secret passage should be clear enough now.