The Infinity Ring is a Time Travel Device. Dak, Sera, and Riq use the Infinity Ring while fixing the Great Breaks.
History and Usage
The Infinity Ring was started by Mr. and Mrs. Smyth, and finished by Sera Froste, who added 'The Missing Piece.' It was temporarily 'broken' and fixed in Curse of the Ancients.
In Behind Enemy Lines, Tilda
stole the Infinity Ring and used it to create the Eternity Ring.