You have only 4 minutes to do that so be wise and bring some white potions

At job level 40 or 50 you can change job at the printer castle and talk to the captain of crusader here to accept a quest of collecting items. If you don want it you must have the Rappelz Rupees items scared marks and patriotism marks with you in order to skip this test.

After that, they will ask you to find the suffering man at the underground dungeon of the castle. He will send you to a place where there are a lot of monsters and you must pass through them, you must not attack them or you will fail. Bring 200 red potions if you don't have money of 100 white potions with you to prevent from death.

After that find an acolyte to give you a holy water or a priest also can and look for the knight of guardian at the castle then go to the waiting room and kill all the monsters to pass, you have only 4 minutes to do that so be wise and bring some white potions.

After you done all this, go back to the leader of crusaders to change job, you will receive 12 white potions as gift. If you want a pecopeco get the peco ride skill and go to the church outside and look for peco trainer and pay him 2500z to get a grand pecopeco.