Hopo Better Underwater Ruins

--- Mounts of mayhem! --- ♦ Added Zombie Nautilus variants, they come in 3 tiers: Copper, Gold, and Iron, each one scales in size, health, speed, and damage, making them more challenging as you progress. They guarantee their armor drop, another way to get this item. ♦ New Turtle Drowned mob, equipped with a Turtle Helmet and Stone Spear, there is a 50% percent to spawn replacing one of the turtles of the underwater city, drops one turtle scute, requires timing to defeat him. ♦ Some ruins have been tweaked axolotl cage, with a Nautilus cage. ♦ Tweaks on loots and some ruins. ♦ Nautilus armor can now be found by brushing suspicious gravel. ♦ Updated to 1.21.1