I used mine, Onyx, to finish The cave in the south and get the artifact of the hunter. I know you're probably scared for your baryonyx to die, but don't worry. Onyx had around 2094 Hp or something. When it gets tranqulized, just wait until it's at 0.0 torpor. It takes awhile, but at least your baryonyx doesn't die. Because they can't fit in the artifact room, go in with a metal hatchet, and kill the creatures in there, get the artifact, and pass out. If you do, be close to your baryonyx, it can protect you. Baryonyxs can jump fairly high, and get your artifact back safely. I tributed mine, and got a mastercraft metal pick blueprint, soothing balm, and a primitive fishing rod. HIGHLY RECCOMEND TO USE IN CAVES!