They were both shaped like small spheres that looked simultaneously incredibly ancient, yet also far more advanced than a medieval world like Sorrel and Cygnus' would suggest. One had a wave-like pattern on the bottom of it that glowed a soft sea-green and the other one had cloud-like waves carved on the top of it that glowed a soft blue-violet.
"There are two more as far as we know." Cygnus said. "We were given the Ocean Key by the Immortal Four after proving that I was The One the prophecy said." Cygnus said, motioning to the sea green one. "And we found the Sky Key in Aozora after chasing down a Phantom Thief." Cygnus said, motioning to the Blue-violet one.
"Apparently they're supposed to open up the path to Xanadu and bring peace to Phaeton once all four are found and placed in the right spot."
Zephyr nodded as Munchie got comfy and curled up in Cal's lap again.
"Oh.... About seven hundred give our take...." Zephyr said regarding his age in the most casual manner as he got to making the two of them soem tea.