holy crap this is going to be frekin amazing ,zero gravity could be used to get to high places and nukes used to destroy entire buildings , but i think nuke is a little u know to powerfull so u should just make a modifier that modifies how powerfull a tnt is so u dont accidently destroy ur entire house but have controled explosions for tnt mining.
I think that maybe the dragon tools should have infinite durability, since the dragon scales are supposed to be so rare. I like how the obsidian is more durable than diamond, but not as fast. That seems to make sense, since obsidian is harder than diamond (assumed from taking 15 sec to mine). It lasts longer, but it's harder to sharpen.