At level 80, you pick an element to master and learn the mastery skill for that element. You can only pick one or the other, and it requires a skill book. At level 100, Ice Mages get the passive skill Freeze and Fire Mages get the passive skill Immolation.

PRIEST (souryo)
Priests are generally a support class, although some like to use them to combo and battle. Skills consist of battle skills, healing skills, and buffs.

Battle skills include Mace Combo, Brace, Mace of Justice, Giant Swing, Blessed Swing, and Holy Bless.

Healing includes Self Cure, Cure, Mass Cure, Party Cure, Cleansing, and Resurrection.

Buffs are Encourage, Protect, Bless, Divine Force, Wind Rush, Protect All, Party Protect, Party Bless, Party Divine Force, and Party Wind Rush.

Pure INT priests and pure STR priests have lower defense than standard priests and need costume sets and/or G gears. Pure INT priests depend on others to level 100% of the time since they can't do any damage on their own. Priests generally lose the ability to solo past level 100, but by that time they have already mastered many buffs that grant them easy access to parties (should others decide that they need parties).

Support priests spend lots of Seal Online Cegel  on AP potions and often lose Seal Online Cegel since loot isn't randomized. It's best to use a priest to support your friends, as long as you know that they will share money with you. The standard support priest build is to get the STR/INT/WIS for armors and add the rest into INT. The standard battle priest build is to get STR/INT/WIS for armors and add the rest into STR. Obviously, support priests have the strongest buffs hands-down.

JESTER  (geinin)
The clown/jester is a support class and a damage dealer. As a jester, you'll be getting some buffs to help your party while still being able to fight. You can either be a combo jester or a throwing jester. Combo jesters usually pick STR/AGI builds, although sometimes they might get the INT needed for armors. Throwing jesters obtain a passive skill called "Throw Anything" (sometimes called "Random Throw") that allows you to throw stackable items from your inventory to use as an attack. This requires lots of INT, so people that do this usually pick INT/AGI or pure INT builds. Throw Anything is based off of your magic attack, and the NPC cost of the items you use increases the damage dealt by thrown items.