Ritual

Rituals are magic ceremonies consisting of a series of actions performed by magic casters in the New World.

Background
Tier Magic is the main magical craft that flourishes the New World. Despite years of study and research, the inhabitants of the New World barely comprehend its power. Whereas the Players, who originally brought its power, could easily cast spells of the 6th tier and above, the average magical standard in the New World is at 2nd or 3rd tier. For that reason, rituals are used as a mean to bypass those limitations.

Additionally, they enable magic casters working in unity to achieve levels of magical phenomena that can't be normally acquired in living time. Magic casters in the New World perform rituals to gain further access in using spells that is said to be impossible to achieve under normal conditions. For instance, there was one country like the Slane Theocracy in particular that conducted a ritual to use 6th Tier spells and possibly beyond.

Mechanics
Rituals tend to vary in different uses and purposes. The necessary components for performing a ritual depends on several factors: skill of the focal user, special items, type of magic etc. However, fundamentally, the purpose of all rituals are to temporarily increase one’s magic power by concentrating the magic power of a group into one person.

List of Rituals

 * Death Spiral
 * Planar Eye
 * Ritual of Holy Fire

Trivia

 * The Lizardmen Alliance used some sort of unnamed ritual-type magic in summoning Swamp Elementals during their war against Nazarick's army of undead.
 * So far as the Light Novels have shown, the nations of the Slane Theocracy and Roble Holy Kingdom are known to actively use rituals.
 * Wild Magic also utilizes rituals as explained in Volume 9.
 * Likewise, Ainz is capable of performing a ritual to learn new spells as well as for other purposes, like enhancing his undead creation skills.
 * According to the Slane Theocracy's Cardinals, the Black Scripture is said to be capable of conducting a grand ritual jointly as a group to summon the highest-ranked angel.
 * Fluder had once cast an unknown ritual spell on himself with the intention of becoming immortal through it, but it did not seem to work out as planned since he is still aging but at a slower rate than most humans.
 * Calca possess a magic crown that allow her to cast a grand ritual spell called the Last Holy War.