Besides showing strength, there was only one way to pass through here. "Contribution of body"? Lynch recalled the severed limbs outside and couldn't help but feel a chill. However, at the same time, he dismissed his own idea. Unless you're something like a centipede, how does a normal human have so many limbs to chop off? Moreover, it's impossible for members of the Severed Limb Temple to enter just once in their lifetime and never come out — would they have to cut off an organ every time they entered or exited? Unless this sect was entirely composed of regenerating Trolls, they would have been driven to extinction by the costly "entry and exit fees" long ago.
In that case, there's only one reasonable explanation: they need to contribute a part of the body, but it couldn't be one of those important and non-regenerable parts. Lynch immediately thought of hair, which seemed like a perfect offering. But another question followed: where should it be offered?