The Tree of Mourning was a shrine of the Order of the Flame in the days before the Dark Wars. It is here that the Cypher Rune, the key to the Ancients' Gates, was laid to rest. In the centuries since the end of the wars, the forest around the tree had grown into a dark, impassable swamp, the Shadowmire.
In order to open the Mother's Eye, Rynn travels into the Shadowmire and recovers the rune. Empowered by the rune's magic, her dragon - Arokh - is able to open the gates. They then set out on a mission to open four other gates scattered across the land.
Drakan: Order of the Flame - Drakan: The Ancients' Gates