Undead Ice Dragon

A vast, ancient dragon of terrible cold that dwells beneath the Great Tree in the Shadowfell. It rose in response when the party destroyed the necromantic crystals that were siphoning soul-energy from below.

The party barely escaped as its icy breath tore through the collapsing portal. Its full power remains unknown, but the Eladrin's warnings suggest it is connected to something ancient that has now noticed the Tree's defense.