Using Siege FX GPG's proprietary special effects scripting engine each spell is accompanied by dazzling effects that match the intensity of the spell. Players can later create their own spells and special effects using the Siege FX system. Character development is one of the key aspects of Dungeon Siege. Players have complete control over the evolution of their characters. They can develop their characters by choosing which weapons or spells they use in combat.
Any character can use any weapon or any spell, and improve in that skill through experience.
Magical weapons, armor, and items can also temporarily increase any of the characters attributes or skills. The multiplayer game offers three modes of play. Although the fundamental gameplay is the same, each game 'plays' very differently. The first mode of play the traditional multiplayer game uses the same world as the single player campaign. These options are all selected by the game's host and can be mixed and matched to create virtually thousands of different games.