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Viper is the holder of the Indigo Pacifier. He is a member of the elite Vongola assassination team, the Varia, under the name Mammon (マーモン). Known as the Arcobaleno's best spellcaster,[1] Viper has the ability to cast illusions, as well as being able to locate any person by sneezing into a piece of paper (he carries a roll of paper with him); the spit or mucus that sticks to the paper shows a map leading to the desired person.[2] Other than for the exception of the Arcobaleno trials, Viper only works for money and is therefore represented as the sin of greed in Varia. He also has a black frog named Fantasma that lies on top of his head. By turning into a yellow ouroboros (a snake devouring it's own tail that is also an alchemist's symbol) into a "halo" above him, Fantasma can give Mammon the ability to fly in combat.[3] He claims to have been trying to break the Arcobaleno curse, and had sealed his pacifier so that other Arcobaleno cannot sense him with the Mammon Chain, which also seals the power of Rings and Boxes and such.[1] The Chain is replaced by the Vongola by the cap that conceals the Rings' powers the same way as the Chains.