Homebrew
Permanent Spirit Vision, Dark vision 60ft
Frost Domain: The spirit can create a considerable Frozen domain centered within a 30 to 60 foot range spanning a 300 foot radius. Those within the domain take 2d8 cold damage if they start their turn there. In addition the area is considered difficult terrain to all but the spirit and its master. The domain remains until the Frost Shadow is defeated or the master orders it dismissed.
Formation: The Frost Shadow forms a colossal crystalline frost scythe.
Reap: The Frost Shadow hits with the frost scythe two times. 15ft range 1d20+8 to hit. 2d8+10 cold + 3d12 slashing
Sow: The Frost Shadow Throws Its scythe. 20ft/30ft range 1d20+6 to hit. 2d8+10 cold + 5d12 slashing
Icy Fortress: Once per turn the Frost Shadow can heal 4d6 damage. This also grants +2 ac until the spirit is hit again as it covers itself in hard healing ice (this feature dose not stack).
A spirit armored in ice that wields a giant ice scythe.