You can’t tranq these guys, they are like dragons you have to steal eggs. You can find their caves in the volcano area on Lost Island. Once you have some eggs you need to feed it Amber Gris as there is a glitch at the moment that won’t allow it to eat sulfur. You can only get the Amber Gris on Genesis so you will have to admin spawn it in if your playing unofficial. To get them to breed you need to breed them in lava