Human Spirit of Ice
The Human Spirit of Ice was created from Ancient Megatheriumon after his battle with Lucemon in the past. From there it passed to Ofanimon's keeping where she hid it in an icy cave. When Cherubimon betrayed the Digital World and began his conquest of it locking Seraphimon into an endless sleep and imprisoning Ofanimon in a prison of light she was able to call Legendary Chosen to the Digital World. From them the Spirit of Fire chose Tomoki to posses it and so he was able to spirit evolve into Chakkumon.
(Note: Is called Spirit of Ice H in the TCG.)