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It could even go into a darker route. Trapping the souls of the creatures in shamanic totems or cards or whatnot. It could be considered evil by the general populace of NPCs and be an underground thing. Imagine the trapping medium having different versions.. Say you trap it into a card/ball/whatever that is a hellish arena, making the creature stronger, but making it hate you like the Doomguard summons in World of Warcraft.