Cosmic Anchor

"It ebbs and flows like the rest of Si'Ull, and only through it do you know permanence." - The Queen of Whispers
According to the Queen of Whispers, the Cosmic Anchor is a device created by the Star Elves to allow physical existence to occur - it is an object of such power and potency that it managed to keep the material plane in tact even when the Sundering stripped Orre of magic for 100 years, even now tens of thousands of years later magic isn't nearly as powerful as it was said to have been during the time of the Star Elves. 
When asked the Queen of Whispers said its current location is Rosesea though it originated in what is currently Esterwyn and though she was rather cryptic, it can be inferred that it changes shape and form and is possibly sentient.
According to Revek Elzedze's notes the Anchor isn't an 'it' but rather a 'she'.