Spear
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Because TechnoCrazy has a powerful weapon, just like a mafia boss. The Mechanic has a dog, which is a distinctive feature that sets him apart from all other roles. And when it's said that a hero left something at home that could have saved him, the most logical explanation is that it's something unique that can serve as an identifier for the character, rather than something that several roles have. Seriously, it seems so obvious to me that it couldn't be any clearer.
