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When cast, the spell forges a telepathic bond among intelligent, willing creatures, each creature linked to all the others. The creatures can communicate telepathically through the bond, regardless of language. No special power or influence is established as a result of the bond, and once it is formed, it works over any distance (although not from one plane to another).
A wish spell can make a Rary’s telepathic bond permanent, but it can bond only two people per wish.
A piece of eggshell from two different species of creature is required to cast the spell.
Jonathan Tweet, Monte Cook, Skip Williams (August 2000). Player's Handbook 3rd edition. (Wizards of the Coast). ISBN 0-7869-1551-4. Ed Greenwood, Sean K. Reynolds, Skip Williams, Rob Heinsoo (June 2001). Forgotten Realms Campaign Setting 3rd edition. (Wizards of the Coast), pp. 62–66. ISBN 0-7869-1836-5.