Assassins and Rangers are the sub-classes of Scout, Scout is one of the four main classes in Aion Online, Warrior, Scout, Priest, and Mage. Assassins and Rangers are going to be introduced one by one in the following ways.
Assassins are skilled at stealthed DPS. Daggers and swords are their primary weapons. The bulk of their abilities is about stealthing, applying poisons to their weapons. Assassins in PvP scenarios are a threat to most classes, mainly because they are granted with the abilities of sneaking up on just about any opponent and deal massive amounts of damage before their opponent gets the first chance to respond. This is their big advantage. The Assassin gets vulnerability when they are spotted first. When in combat, Assassins primarily use evasion and stun locks to defeat their opponents. If you like playing rogues, stealthing, dealing large amount of damage, then an assassin is your perfect choice.
Rangers are the masters of long-ranged physical damage. A bow is their primary weapon, swords and daggers are used for meleeing. Rangers rely on keeping their opponents at a distance by using traps, stuns, and abilities. When playing a Ranger solo, the main form of killing each mob is by kiting. Unlike WoW, where Hunters had pets, Rangers do not. Rangers are experts at bow, and has the ability to deal large amounts of burst damage. If you like kiting, launching arrows at a distance, and using lots of tactics to defeat your opponent, they the rangers are the class you are looking for.