There are over a thousand skills in the game that can be acquired by the character over time, but players may only use and equip up to 8 of them at any one time. This introduces levels of strategy, in which one must have a careful selection of skills that work well with one another and with teammates in order to survive.
The core professions are Warrior, Monk, Elementalist, Ranger, Necromancer and Mesmer. The Assassin and Ritualist professions are exclusive to Guild Wars: Factions, which can be played along with the aforementioned core professions. The Paragon and Dervish professions are exclusive to Guild Wars: Nightfall, and can also be played with the core professions. Unlike the campaigns, Guild Wars: Eye of the North (the only expansion pack of the Guild Wars franchise) does not offer any new playable professions.