Part of Arena is Crystal Capture an Alternate Warband vs Warband game play.
Crystal Clusters are treated as structure tile effects. Any model may pick up a crystal token when adjacent to the opposing player’s crystal cluster using the Interact action. Place a crystal token next to the model. That model is now carrying the token. If the model is destroyed, place the crystal token in a square adjacent to the model before removing the model. A friendly model may use the Interact action to pick up the dropped crystal token. A warband may only have one crystal token in play at a time. When a model carrying a crystal token moves into a square adjacent to a friendly crystal cluster, its warband captures one crystal token and earns one point token. Remove the crystal token from the arena.