Ancient mob for the nether

The sniffer was added to Minecraft a few years ago, but I can't help but wonder what sort of ancient mob might exist in the nether. I suggest a "Pyrosaur" mob (we can work on the name more later, if you have another name idea, please put it in the comments), this mob would be found by exploring new ruins in the nether wastes, this will require adding suspicious netherack which the player will get items out of by dusting it off with a brush, the player could get new armor trims (ghast, blaze, wither etc.) or they might get lucky and find a Pyrosaur egg which will only hatch if it is submerged in lava. The Pyrosaur will be immune to fire damage and could be tamed by feeding it lava (using a lava bucket), once tamed the Pyrosaur can be milked to get lava. The Pyrosaur will be about the same size as the sniffer and will be ridable, it will be able to swim quicky over lava (even with the player riding it) and if it's tamed it will attack any mobs that attack the player or have been attacked by the player. The Pyrosaur will set mobs on fire when it attacks them and will be hurt by water. The Pyrosaur will also attack the player if it is untamed and the player has either attacked it or poured water on it.

Once again if you have an idea for another name other than Pyrosaur, please share it in the comments!