[alext]

Any class can solo effectively. Generally speaking, you'll be safest with a Priest, but fights will take a long time. Mages are the riskiest, but fights are over quickly. Fighters and Scouts will be in the middle, with Fighters slightly safer and slower.Bards are good at soloing; they have stealth to avoid trouble and Selo's songs to get out of trouble, and they use both spells and combat arts. Crusaders, particularly Paladins, are good too, since they have both spells and combat arts, and Paladins can heal themselves fairly well.Priests are not bad, but their melee abilities are limited and so they take a long time to defeat a foe solo. A Druid (particularly a Fury) in animal form is probably the most melee-capable Priest.However, the real answer is this: play what you like. If you're interested in a Shadowknight, try one out. You can reach level 10 in an hour or two, and you'll have a good feel for how it plays. By level 20, you'll know for sure if you can solo effectively.And if you can't solo effectively, find a group! It is an MMORPG after all!