Summon

A Summon is a ritual performed in many video games that allows the player, character or party to call upon a being of immense strength to aid them in battle. This aid can may be provided in the form of a controllable (or directable) party member, or a one-off super-attack. While the terminology of the summoned beings differ (Demons, Aeons, Primals, Eidolens, Monsters, etc), the act of Summoning is key, which differs greatly from game to game.