the volcano biome

the volcanos will be made with coal blocks on the outside and lava on the inside and around the volcanos there will be palm trees and long neck dinosaurs and teredactles and the T-Rex would be the final boss and if it is defeated you will unlock a secret entrence to a new dimension called the underworld because it is under the volcano the underworld will have bats and phantoms and cyan fog and another boss mob called the void eater and it would be the hardest one to defeat. Hope you like my idea. pls ad it to mincraft.