Horizons of Spirit Island

Why adding Blight to the board is bad?

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After Setup, whenever you add Blight to a land, in that land, Destroy one Presence from each Spirit with Presence there (including when Blight cascades). Destroyed Presence is placed next to the Island, not returned to the Spirit Panels. Additionally, if the Blight pool is ever empty, you lose the game.
Related Rule(s)