Spells
Source: Advanced Player's Guide, p. 54
A summoner casts arcane spells drawn from the summoner spell list (see page 64). He can cast any spell he knows without preparing it ahead of time, assuming he has not yet used up his allotment of spells per day for the spell’s level.
To learn or cast a spell, a summoner must have a Charisma score equal to at least 10 + the spell level. The Difficulty Class for a saving throw against a summoner’s spell is 10 + the spell level + the summoner’s Charisma modifier. A summoner can cast only a certain number of spells of each spell level each day. His base daily spell allotment is points of electricity damage per oracle level. A Reflex save halves this damage. You can use this ability once per day, plus one additional time per day at 5th level and every five levels thereafter.