Group buffs are a mana- and time-efficient means to distribute buff spells. Usually group buffs have a longer duration than the spell that they distribute. They almost always require a reagent. Nowadays almost all buffs are group buffs, and they do not require reagents anymore. Distribution occurs as a group buff is cast on a target; characters that are "similar" to the target will also get the buff. Similarity depends on whether the spell is a party buff or a greater blessing.