The Reign Of Winter
Spells: A sorcerer casts arcane spells drawn primarily from the sorcerer/wizard spell list presented in Spell Lists. She can cast any spell she knows without preparing it ahead of time. To learn or cast a spell, a sorcerer must have a Charisma score equal to at least 10 + the spell level. The Difficulty Class for a saving throw against a sorcerer’s spell is 10 + the spell level + the sorcerer’s Charisma modifier.
Like other spellcasters, a sorcerer can cast only a certain number of spells of each spell level per day. Her base daily spell allotment is given on Table: Sorcerer. In addition, she receives bonus spells per day if she has a high Charisma score (see Table: Ability Modifiers and Bonus Spells).
A sorcerer’s selection of spells is extremely limited. A sorcerer begins play knowing four 0-level spells and two 1st-level spells of her choice. At each new sorcerer level, she gains one or more new spells, as indicated on Table: Sorcerer Spells Known. (Unlike spells per day, the number of spells a sorcerer knows is not affected by her Charisma score; the numbers on Table: Sorcerer Spells Known are fixed.) These new spells can be common spells chosen from the sorcerer/wizard spell list, or they can be unusual spells that the sorcerer has gained some understanding of through study.
Upon reaching 4th level, and at every even-numbered sorcerer level after that (6th, 8th, and so on), a sorcerer can choose to learn a new spell in place of one she already knows. In effect, the sorcerer loses the old spell in exchange for the new one. The new spell’s level must be the same as that of the spell being exchanged. A sorcerer may swap only a single spell at any given level, and must choose whether or not to swap the spell at the same time that she gains new spells known for the level.
Unlike a wizard or a cleric, a sorcerer need not prepare her spells in advance. She can cast any spell she knows at any time, assuming she has not yet used up her spells per day for that spell level.