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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 given on Table: Summoner Unchained. In addition, he gains bonus spells per day if he has a high Charisma score (see Table: Ability Modifiers and Bonus Spells).

A summoner’s selection of spells is limited. A summoner begins play knowing four 0-level spells and two 1st-level spells of the summoner’s choice. At each new summoner level, he gains one or more new spells as indicated on Table: Unchained Summoner Spells Known. (Unlike spells per day, the number of spells a summoner knows is not affected by his Charisma score. The numbers on Table: Unchained Summoner Spells Known are fixed.)

Upon reaching 5th level, and at every third summoner level thereafter (8th, 11th, and so on), a summoner can choose to learn a new spell in place of one he already knows. In effect, the summoner “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, and it must be at least 1 level lower than the highest-level summoner spell the summoner can cast. A summoner can swap out only a single spell at any given level and must choose whether or not to swap the spell at the same time that he gains new spells known.

A summoner doesn’t need to prepare his spells in advance. He can cast any spell he knows at any time, assuming he has not yet used up his allotment of spells per day for the level.

Cantrips: A summoner learns a number of cantrips, or 0-level spells, as noted on Table: Unchained Summoner Spells Known. These spells are cast like any other spell, but they do not consume any slots and may be used again. Cantrips prepared using other spell slots (due to metamagic feats, for example) consume spell slots as normal.

Eidolon
A summoner begins play with the ability to summon to his side a powerful outsider called an eidolon. The eidolon forms a link with the summoner, who forever after summons an aspect of the same creature. Each eidolon has a subtype, chosen when the eidolon is first summoned, that determines its origin and many of its abilities. An eidolon must be within one alignment step of the summoner who calls it (so a neutral good summoner can call a neutral, lawful good, or chaotic good eidolon) and can speak all of his languages. An eidolon is treated as a summoned creature, except it is not sent back to its home plane until reduced to a number of negative hit points equal to or greater than its Constitution score. In addition, due to its tie to its summoner, an eidolon can touch and attack creatures warded by protection from evil and similar effects that prevent contact with summoned creatures.

A summoner can summon his eidolon in a ritual that takes 1 minute to perform. When summoned in this way, the eidolon’s hit points are unchanged from the last time it was summoned. The only exception to this is if the eidolon was slain, in which case it returns with half its normal hit points. The eidolon does not heal naturally. The eidolon remains until dismissed by the summoner (a standard action). If the eidolon is sent back to its home plane due to death, it cannot be summoned again until the following day. The eidolon cannot be sent back to its home plane by means of dispel magic, but spells such as dismissal and banishment function normally. If the summoner is unconscious, asleep, or killed, his eidolon is immediately banished.

The eidolon takes a form shaped by the summoner’s desires. The eidolon’s Hit Dice, saving throws, skills, feats, and abilities are tied to the summoner’s class level and increase as the summoner gains levels. In addition, each eidolon gains a pool of evolution points based on the summoner’s class level that can be used to give the eidolon different abilities and powers. Whenever the summoner gains a level, he must decide how these points are spent, and they are set until he gains another level of summoner.

The eidolon’s physical appearance is up to the summoner, but it always appears as some sort of fantastical creature appropriate to its subtype. This control is not fine enough to make the eidolon appear like a specific creature. The eidolon also bears a glowing rune that is identical to a rune that appears on the summoner’s forehead as long as the eidolon is summoned. While this rune can be hidden through mundane means, it cannot be concealed through magic that changes appearance, such as alter self or polymorph (although invisibility does conceal it as long as the spell lasts).

Life Link (Su)
At 1st level, a summoner forms a close bond with his eidolon. Whenever the eidolon takes enough damage to send it back to its home plane, as a reaction to the damage, the summoner can sacrifice any number of hit points he has without using an action. Each hit point sacrificed in this way prevents 1 point of damage dealt to the eidolon. This can prevent the eidolon from being sent back to its home plane.

In addition, the eidolon and the summoner must remain within 100 feet of one another for the eidolon to remain at full strength. If the eidolon is beyond 100 feet but closer than 1,000 feet, its current and maximum hit point totals are reduced by 50%. If the eidolon is more than 1,000 feet away but closer than 10,000 feet, its current and maximum hit point totals are reduced by 75%. If the eidolon is more than 10,000 feet away, it is immediately returned to its home plane. Current hit points lost in this way are not restored when the eidolon gets closer to its summoner, but its maximum hit point total does climb to the levels indicated and eventually returns to normal.

Summon Monster I (Sp)
At 1st level, a summoner can cast summon monster I as a spell-like ability a number of times per day equal to 3 + his Charisma modifier. Drawing on this ability uses up the same power that the summoner uses to call his eidolon. As a result, he can use this ability only when his eidolon is not summoned. He can cast this spell as a standard action, and the creatures remain for 1 minute per level (instead of 1 round per level). At 3rd level, and every 2 levels thereafter, the power of this ability increases by 1 spell level, allowing him to summon more powerful creatures (to a maximum of summon monster IX at 17th level). At 19th level, this ability can be used as gate or summon monster IX . If used as gate, the summoner must pay any required material components. A summoner cannot have more than one summon monster or gate spell active in this way at one time. If this ability is used again, any existing summon monster or gate from this spell-like ability immediately ends. These summon spells are considered to be part of the summoner’s spell list for the purposes of spell trigger and spell completion items. In addition, the summoner can expend uses of this ability to fulfill the construction requirements of any magic item he creates, so long as he can use this ability to cast the required spell.