From this page of the guide you will learn what is the maximum character level in Dungeons & Dragons Dark Alliance and also whether you can further develop your characters after you have reached the maximum level.
In Dungeons & Dragons Dark Alliance you can develop your character up to the maximum level 20 (Level Cap). By playing at a lower difficulty level, you can reach the max level roughly halfway through replaying the story campaign. By playing at a higher difficulty level you can speed up this process a lot.
Further leveling - is it possible?
After reaching the maximum level of experience in D&D Dark Alliance there is no way to continue earning XP, and attribute points and Feats points. However, you can still develop your character by finding better weapons.