Eva's Knight Lionel Hunter:
I'll tell you about the fourth test.
First, you must reach Lv. 104 to prove you are qualified to advance to the new stage. You must also pass the tests of the following people and receive their certificates.
Your testers include Commando Captain Sporcha in the Hellbound Refugee Camp, Giant Tracker Leader Krenaht in the Giant's Cave, Fishing Guild Leader Santiago in Heine, and Hunter's Guild President Arcturus in the Hunter's Village.


Only they know what they'll test you on, so go talk to them. If you forget who you must go to, refer to the guide I'll be giving you

All this can be substituted by completing a mission from High Priest Sylvain in the Einhasad Temple in the Town of Dion.
"I'll do that."