Elm phloem necrosis (elm yellows) is a disease of elm trees that is spread by leafhoppers or by root grafts. This very aggressive disease, with no known cure, occurs in the Eastern United States, southern Ontario in Canada, and Europe. It is caused by phytoplasmas which infect the phloem (inner bark) of the tree.he Elm Tree is also referenced in children's literature. An Elm Tree and Three Sisters is a children's book about three young sisters that plant a small elm tree in their backyard. Throughout the years, the sisters begin to realize that the elm tree becomes an integral part of their lives.
Halion. The Obsidian Sanctum is the black dragonflight area of the Chamber of Aspects. The entrance is in Dragonblight [59.3, 49.3] and accessed via a crack in the ice below Wyrmrest Temple. It holds one raid boss, Sartharion the Onyx Guardian, and his three drake lieutenants, Shadron, Tenebron, and Vesperon.
Similarly, the Uldaman quests are spread out over many levels as well. Blizzard stated at BlizzCon 2010 that they plan on splitting the dungeon in two, with the first half ending in the Ironaya encounter, and the second half beginning at the back door where the Obsidian Sentinel is located.