Ritual of Summoning is a core warlock ability learned at level 72. It is designed to summon absent party members to the warlock's location by creating a Meeting Stone. The spell requires that two additional party members be present, who can be of any class.
The warlock begins by casting Ritual of Summoning, which opens a portal. Two present party members then right-click on the portal and must not move until the ritual is complete.
Once the Meeting Stone is summoned, it will be available for 5 minutes and can be used to summon as many party or raid members as needed.
Summoning can be accepted while in flight, but not while in combat. If summoned players drop out of combat during the two-minute time period, they can still accept the summoning; the accept button is merely grayed out until then. A player can also accept a summon after the meeting stone vanishes, provided the initial summon was cast within the last 2 minutes of the meeting stone being active.
The targeted player will be teleported to the location where the portal appeared.
Players can target themselves as the summoning target in order to quickly hearth, repair, and then return to the spot where the ritual was performed. This works inside of an instance as long as the warlock meets the requirements for the instance.
The Meeting Stone can summon from anywhere to wherever the warlock is, even inside the warlock's instance; however, the summoned player must be within the minimum level restriction of the instance.