Spells
Source: Ultimate Magic, p. 9
A magus casts arcane spells drawn from the magus spell list presented on page 13. A magus must choose and prepare his spells ahead of time.
To learn, prepare, or cast a spell, the magus must have an Intelligence score equal to at least 10 + the spell level. The Difficulty Class for a saving throw against a magus’s spell is 10 + the spell level + the magus’s Intelligence modifier. A magus can cast only a certain number of spells of each spell level per day. His base daily spell allotment is given on Table 1–1. In addition, he receives bonus spells per day if he has a high Intelligence score (see Table 1–3 on page 17 of the Pathfinder RPG Core Rulebook).
A magus may know any number of spells. He must choose and prepare his spells ahead of time by getting 8 hours of sleep and spending 1 hour studying his spellbook. While studying, the magus decides which spells to prepare.