Define "Rift" in the context of Riftbound.

In the context of Riftbound, the term "Rift" specifically refers to a powerful magical portal that players can control. This portal is central to gameplay, as it allows players to summon units and cast spells, fundamentally shaping the strategy and flow of the game. The ability to manipulate the Rift adds a layer of depth, enabling players to influence the battlefield and create tactical advantages over their opponents.

While other concepts like cards, unit types, or energy resources are integral to the game's mechanics, they do not encapsulate the unique function and strategic importance of the Rift as a magical portal. Understanding the role of the Rift is crucial for mastering gameplay and effectively executing strategies in Riftbound.