Rituals are spells that require more than one participant (usually 3 participants), similar to Meeting Stones. Current rituals include:
Warlock's Ritual of Summoning -- Summon a non-present party member to the warlock's location.
Warlock's Ritual of Doom -- Sacrifices a random participant to summon a Doomguard.
Warlock's Ritual of Souls -- Creates a Soulwell, containing Master Healthstones.
Mage's Ritual of Refreshment -- Creates a Refreshment Table, containing Conjured Mana Biscuits.