A leechline is a line, usually something like 150lb spectra, threaded through the tunnel created by the trailing edge hem. It is pulled *just* tight and helps stop the trailing edge vibrating in flight so reducing that rasping noise you get on kites with slack trailing edges. If its quiet I expect your Prism has one sewn in but maybe a Hypnotist owner can confirm this.
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I just took a look at my Hypno. Nope, no leechline in it from the factory. I guess I know one of the upgrades I'll do to it shortly! It's down for repairs right now anyway, so what the heck.
