Чтобы стать Crusader Вам нужно быть 40+ джоб swordman. Поговорите с  Senior Crusader, который находится в Prontera Castle prt_castle (45, 169):

Войдя в замок идите прямо по коридору через два портала, затем идите налево пока не увидите лестницу с порталом, войдите в портал. Там в углу у шкафа стоит нужный Вам NPC.
NPC  попросит принести лут:

Decayed Nail x 10 (авпадает из Zombie)
Danggie x 10 (выпадает из Munak)
Worn-out Prison Uniform x 10
Stinky Scale x 10 (выпадает из Megalodon)

или

Lantern x 10
Horrendous Mouth x 10
Rotten Bandage x 10
Jack o’ Pumpkin x 10

или

Skel-Bone x 10
Orc Claw x 10
Manacles x 10
Short Daenggie x 10

01 Which attribute is the most effective in atttacking the Undead? Holy
02 If the monster is a Level 2 Undead, how much more damage does a Holy attack do compared to Fire? 50%
03 What item can you not get from an Evil Druid? Monk Hat
04 Which Undead monster has the highest HP? Zombie Prisoner
05 Which of the following monsters is a different size than the others? Drake
06 Which card grants you tolerance to Undead property attacks? Orc Zombie Card
07 What was the relationship between Munak and Bongun before they passed away? Childhood friends in the same village
08 Which of the following monsters is not aggressive? Skeleton
09 What is the name of the shield in which a Munak Card has been inserted? Amulet Shield
10 Which of the following monsters does not drop Memento? Munak

или

01 Which of the following monsters is a different attribute than the others? Isis
02 Which sword is effective in attacking Demon monsters? Decussate Tsurugi
03 Which item is NOT dropped by Dokebi? Golden Hammer
04 Which Demon monster has the most HP? Marionette
05 Which Demon monster is a different size than the others? Ghostring
06 Which shield reduces damage inflicted by Demon monsters? Shield from Hell
07 Which attribute is the most effective on the Wind Ghost? Earth
08 Which monster is different from the other Demon monsters? Whisper
09 What effect does the Marionette Card have? Increase defense against Ghost attacks by 30 %
10 Which of the following is an effective way to react when encountering a demon monster? Put Holy Water on a weapon and attack.

или

01 What level of ‘Divine Protection’ do you need to learn ‘Demon Bane?’ Level 3
02 If your INT is 30, including INT bonuses from quipment, at level 55, how much HP does Level 5 Heal recover? 440
03 With Level 7 Divine Protection, by how much is your defense against the Undead increased? 21
04 Which of the following spears can attack Nightmare, which is endowed with the Ghost attribute? Zephyrus
05 What level of ‘Heal’ do you need to learn ‘Cure?’ Level 2
06 What is the attack speed when Level 3 Cavalier Mastery is learned? 80 % of normal speed
07 Which of the following is not correct of the Demon Bane skill? Only Acolytes can learn the skill
08 How much SP does Level 7 Heal use? 31
09 hat status cannot be cured with the Cure skill? Curse
10 What best describes a Crusader? One preparing for the Holy War.

После того, как Вы всё правильно ответите, Вас вновь направят в Prontera Castle. По пути попросите у какого-нибудь приста или купите Holy Water и не выкладывайте Rosary. Вам надо придти в ту же локацию, где и Senior Crusader, но на это раз нам надо поговорить не с ним, а с Patron Knight prt_castle (35,151) .

Он заберет у вас Holy Water и отправит в комнату ожидания перед испытанием. Там вы увидете все того же Patron Knight с табличкой Waiting Room, войдите в нее и ждите пока вас не перебросят непосредствено в локацию с монстрами, которых на этот раз придеться убить всех. Хорошо бы к этому моменту запастись хорошим набором лечилок и всевозможными кастами от пристов. Продвигайтесь осторожно, убивайте монстров по одному.

После вновь поговорите с Patron Knight и он отправит вас сдавать квест все тому же Senior Crusader.

Поздравляем, Вы -  Crusader!