Sidji
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Example: Let's say I chose an enchanted arrow – a fireball. I shoot it with a ranger. But then I don't need such a powerful spell as a fireball, and I don't need any spell at all – but I can't cancel the enchanted arrow; I can only switch to a magic arrow or a slowing effect, which consume less mana, but still consume some. I need it so that I use the fireball once on the arrow and then shoot without the spell and mana cost.