An industrial boss that when defeated would drop iridium and other metals
the boss spawner would be like the wither but instead of soul sand it would use dense advanced alloy blocks where 9 advanced alloy compress into one dense advanced and 9 of them craft into one dense advanced alloy block.
The block at the top centre of the t shape would be an advanced circuit block, which could be crafted from 4 advanced circuits and 4 Lapotron Crystals and circuit regulator (rare find in chest).
Also the bosses head would be a rare find in chest and would be placed on the advanced circuit block.
Iridium would no longer be found in chest
The boss would deal a lot damage (not worth fighting with out at least full nano armour). Also would take more than few blows with nano saber may be worth basting it with TNT or throwing sticky dynamite.
Also the boss would want to destroy all machines within 7 - 10 chunks.
when killed the boss would drop 0-3 iridium, 0-5 diamond, 0-4 energy crystal (random charge levels),3-20 bronze, 5-30 copper, 3-20 tin, 3-20 iron
and are drop of it head which can be ware by the player which give then regeneration or some other power up (only works after the boss has been killed) or can be used a second level boss even harder to defeat that even deals damage throw a full quantum suit and maybe requires a few nukes to kill it.