The Boss Poison Aura mod is a mod that adds a poison aura to every boss. If you're inside this aura, you'll be poisoned. Stepping just outside the aura will remove the poison. You can adjust the aura's radius and decide if the boss's other parts should also have the aura. The mod includes a modified poison debuff that isn't affected by the bezoar (though this feature can be turned off in the settings).
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