New Iron Monstrosity boss

Minecraft has 2 bosses, and i feel it could need more. This is why I suggest the Iron Monstrosity. It wouldn’t take projectile damage, rendering bows and crossbows useless. It would either be found by mining a new block, corrupted iron ore, or summoned by the player like a wither, using jack o’ lanterns instead of wither skulls. You would have a raw iron block (the block might turn red when the boss is summoned) as the “heart” of the Iron Monstrosity, and need iron blocks to summon it. It might drop a new enchantment, if I’m not already asking too much, called health boost. With 5 tiers in total, you would get one heart for tier 1, up to five hearts for tier 5.