Combat in Citadel of Sorcery uses an icon-based system. The player will target an enemy, then select an icon on their hotbar to use an ability. Melee attacks only require the player to be in melee range, while range attacks must be aimed. More specifics about combat will be released during Alpha testing.
Citadel of Sorcery does not use the holy trinity. There are no dedicated tanks, healers, or damage dealers. Instead, players will have to build their character to be at least a little proficient in everything; (eg. a sorcerer will need some melee skills and a warrior will need some healing and ranged skills.) Players can still specialize, they just need to know the basics of other types of skills as well.
Enemies in Citadel of Sorcery are smart. They are not bound by traditional MMO concepts such as aggro or aggro radius. The AI is capable of creating their own strategies such as flanking or setting up an ambush. They will adapt to the player's strategies keeping them on their toes. Using the same strategy for every foe will not work.
Players will be eased in to these mechanics as they advance through the different tiers.