There are 4 types of spells: 1. * Sorcery - These spells often resolve instantly and are permanent only in the sense that, unless changed, their effects are there; they don't continually do something. 2. * Enchantment - These spells have an effect (buff, curse) on a target of some sort. They continually do something. 3. * Aura - These spells are only activated when something else is done, at which point they evaporate. Until then, however, they reside ('stay in play') much like an enchantment but remain passive. 4. * Summon - These spells summon creatures named after the spell. Creatures remain until they are either destroyed (zero or negative hp) or deceased (duration left less than 0).