When taming it make sure to feed it blood packs, whenever you are close to taming it (70-80%) try to escape then just like the blood stalker you need to let it eat a tame (moschops work the best) when trying to get it to pick you up make sure to move around. And finally whenever you get 100% effectiveness using a couple well leveled moschops youll be able to finish the tame and get a 100% effectiveness bat