The Summoner is a job in Final Fantasy V obtained after the Water Crystal shatters. The Summoner is one of two of the most powerful mage jobs in the game, boasting the highest Magic Power in the original game, bested only by the Oracle in the Advance remake, making it extremely potent with other magic skillsets since they can boost the power of elements with rods.
The Summoner makes for one of the best crowd control jobs in the game, as most of their spells target all enemies for high damage and have access to various elements due to this. The Summoner also has access to various defensive options, including Golem, Phoenix, and Carbuncle. The only downside to the Summoner is the high MP cost of their skills.
The summoner wears green and yellow robes; Lenna's robes are shorter. Each character appears to have a horn growing out of their head. Based on other games that introduced this concept, it is either a clip-on or other such item that can be removed and is only for show.
Summon gives the Summoner access to various abilities that allow them to act offensively or defensively according to the battle. On the offensive, Summon gives the Summoner access to the Fire, Ice, Lightning, Earth, Water, and Wind elements, as well as two powerful non-elemental attacks.
On the defensive, Summon gives the ability to grant Reflect to the party, revive one KO'd ally with full life, nullify physical attacks up to a certain point, and drain HP from enemies to restore HP to the party. Summon also grants the ability to inflict Paralyze or Petrify to a single enemy, and a chance to inflict Instant Death to all enemies on-screen.
Of note, Summon Level 1 will give the character base Freelancer Magic +17. For each Summon level gained, up to level 6, the Magic bonus is increased by 3 per level, for a maximum of +33 Magic at Summon Level 5.