Necrosis or Wizard

[Pyrion]

From all casters wizard is the hardest to solo (well, cleric might be worse). That only changes when you get high enough to quad... and even that requires some time of movement buff that you have to get thru items or other players.

Necro is far easier and has a lot more tools. If you like blasting stuff, consider a magician. Only a bit less efficient with nukes, but you get a totally awesome pet in return. Starting the game as a wizard is a recipe for failure (imho).