What can a parasite offer its human hosts in a mutualistic relationship?

Working on a story right now where parasite-controlled humans essentially become the apex predators in the world, and harvest uninfected humans to further spread the organism.

These kinds of mind-controlling parasites are not that uncommon in nature. But I want to take it one step further. I want true symbiosis between the parasite and its human hosts. It's easier for the parasite to do its work if the human body isn't always fighting back so it needs to provide some kind of benefit or incentive to the infected human.

What kind of benefits, in the form of physical enhancements/attributes most likely, could a parasite offer its human hosts?

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What can a parasite offer its human hosts in a mutualistic relationship?

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