Golem overhaul and endgame building

Minecraft becomes at some point too easy and iron golem farms not only do that but they also disregard the golems main function of being a defence for the village, so an overhaul to the golems is needed and a new method of obtaining iron needs to be created. First and foremost golems need to be immune from lava and it's iron drop rate should be decreased to 1 iron bar that is a rare drop, but it's speed is increased by 1.5 times and it recieves a damage reduction of 40%, it can follow you and teleport to you by right clicking it. As for the new method of obtaining iron is as it's followed: there's an arena in which you fight mobs for different ore types and the difficulty is determined by the ores you are looking for, it's of course an endgame building in which you need to defeat the ender dragon and it's head is the key to acess the building. It has multiple levels that goes from the top of the sky down to the lowest y levels. It's coated by unbreakable blocks and the more deeper you go, the more harder the levels become and the quality of the ore types becomes higher. The dungeon gives a new unique post endgame challenge that also grants a new ore obtainment method. The ore difficulty is as it follows:1)wood 

2) cobblestone

3) copper

4)iron

5)gold

6) diamonds

7) obsidian

8) netherite

It's obvious that wood, cobblestone and obsidian aren't ores but they are important building materials,the wood and cobblestone levels are "tutorials" or and the obsidian level acts as a barrier