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Hellboy is a 2-star base, Gold, Arcane hero. His shards can be obtained in his challenges or a Premium Hero Chest.
Strategy[]
His passive's wording can be misleading; it gives Hellboy healing equal to a percentage of DoT he receives, up to a cap (% of his max health). This does not define his DoT reduction - he always takes no damage from damage over time effects, no matter how strong they are, making him an ideal hero for raids.