As the Icebreakers continue to delve into the arcane ruins of Ythryn, a cryptic message leads them to seek out the legendary Wand of the Nether Oak. Their search takes them to a strange, verdant arboretum nestled deep within the earth—an eerie oasis of life beneath the glacier. But ancient magic lingers in the soil and branches of this underground forest, and nothing in Ythryn grows without a cost. What secrets are hidden among these roots… and what watches from within the leaves?