In ancient time of the world of D&D there were no limits for what magic could do. But then Mystra, the goddess of magic after Mystryl was forced to sacrifice herself to save the weave from Karsus' foolishness, decided that such magic was too powerful, reducing the strength of spells an individual could cast to 9th level. Due to the impossibility for a mortal to have 10th level or higher spell slots, there must be a number of secondary casters, each using a 9th level spell slot, to cast it as shown in the **Casters**. In addition to the secondary casters there are also the main caster who is the person actually casting the spell. This person chooses the targets of the spell and any other choice that must be made to cast the spell and could actually make a spell target some of the secondary casters even if they did not agree to. If a spell requires concentration its only the primary caster who must maintain concentration. Immediately after casting a 10th level or higher spell, all casters must make a DC (10+spell level) Constitution save or suffer from 1 level of exhaustion. |Level of Spell|Number of Secondary Casters| |---|---| |10th|1-5| |11th|6-10| |12th|11-20|