Inside the sheath, their proboscis is actually six arms: two saws, two manipulators, a spitter, and a sucker. They saw open your flesh and use the manipulators to sense blood vessels, which they pierce to suck blood.
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You'll have to go about ninety miles east to Khalighat, for the nearest smiting god. If you like, I could lend you a metaphorical pigeon, or perhaps move a boulder out of your way if you don't mind meditating as I give you strength before doing the actual pushing with your own paws.