Are large avian creatures made of pure Arcane energy, they are a pale blue and purple in colour. The Zaithilien have four large feathery wings, the wings glow and pulse with purple and blue light. They have long strong necks and powerful crystal-like beaks. The avian creatures have long feathery tails that look much like their wings, but the feathers are smaller, the Zaithilen have four eyes that glow with a soft pale light. Once born; they live for a thousand years. The Zaithilien also mate and nest for life. Usually in the highest structure they can see. The Zaithilen nests are a web of bluish purple strands. The nests are very large and can cover a few thousand square feet. These strands along with the Zaithilen, generate raw arcane energy. The Saroc'tal learned from their pool of memories how to harness this energy.
A Zathilien egg is a form of pure Arcane energy. That can either be used for destructive or regenerative means. To use a Zathilien egg in such a manner is one of the few things that can cause a Saroc'tal to act with rage.