As others have said, what you are describing sounds like the anti-paladin class. However, anti-paladins are pretty fragile and are generally the enemy of most of the other characters. If you are new, you will get torn apart. When you have more experience, you will be able to compensate through clever tactics or the use of magic wands that reduce the damage you take (or both).

The next best thing is probably an invoker. Their melee isn't great, but they can change their hands to use the different elements to hurt people, which means that when they do hit, it can be quite nasty. Meanwhile their spells are very destructive. Once you reach a certain level you also have decent survivability, because it is harder for people to stop you casting/fleeing, and you have some spells to reduce the damage you take.

Personally, I always recommend assassins for new players. Felar, arial, human all work quite nicely. Felar are the most brawny, arials the most convenient, and humans generally have easier enemies to fight for a long time.