There are no characters with 15 energy and no skills with a 1 energy cost, which is just a simplified example about
Guild Wars Gold. Energy and even regeneration varies by character. The armor a character wears can include both bonus energy and bonus regeneration. A Ranger will have an extra 5 energy and 1 pip from most of their armor while Elementalists about
Guild Wars Gold, Mesmers, Monks, and Necromancers ¨C the so-called casters because they all use spells to cast - will have at least 10 energy and 2 pips. Regeneration is not available through equipment but energy is, items called foci and staves will grant some bonus energy to your character for
Guild Wars Gold.
Those are innate bonuses, you do not have to do anything more to get them than to wear the armor or focus to have that bonus. Skills need to be cast, often taking some starter energy to establish but can bestow your character or another character with some extra energy or regeneration. A character is energy pool ¨C the amount of both energy and regeneration they can call on ¨C is very much determined by their profession about
Guild Wars Gold. And since energy management is the concern of properly maintaining that energy pool, it is very much something that different professions deal with differently.