Seal

When the Deities of The Astral Sea gathered together to imprison the monstrous threat of Tiamat, they used special enchantments bound up in a complex matrix of matter and assorted forms of energy. When these spells resolved they became physical anchor points for Tiamat's binding. These Seals take many different forms depending on their ambient conditions, scattered across the world of Soma. The Goddess Aether told the Original Eight that four seals had already been destroyed before the party witnessed the destruction of the fifth seal which took the form of a massive surface of Sealstone. 
Recently the party was successful in preventing the erosion and destruction of the sixth seal, the seal of Fate, which takes the form of a massive branchng Evergreen tree in the north of Ossia, near Demra and watched over by The Fey Lord Grandfather Winter.