From Destiny 2 Wiki
|Expansion||Season of the Chosen|
|Boss||Basilius the Golem (Colossus)|
|Description||In a bid to earn Empress Caiatl's favor, a Cabal force has descended on Europa to scour the icy moon for relics of the Golden Age including the secrets of the Exo contained in the Deep Stone Crypt. Travel to Europa and put a stop to this operation.|
Battleground: Hailstone is an Arena introduced in the Season of the Chosen. It was originally part of the Battlegrounds playlist.
With the release of The Witch Queen, and the removal of the Season of the Chosen content, it is now only available through the Vanguard Ops playlist as a randomly-chosen Strike. It cannot be launched as a mission directly from the Director. The version from the Battlegrounds playlist with Champion enemies is also not available.