This material has some potential. But I feel as though the weapon and arrow for it is pretty redundant seeing that we already have the Fire Aspect and Flame Enchantment. And since it's weaker than Iron, anyone would preferably choose Iron with a Fire Aspect enchantment over a Brimstone enchantment. What got me interested was the pickaxe, everything else was quite generally suggested and quite unoriginal. But the ore itself has something about it that would be more exceptional.
why would you use it anyway? you need to have diamond to go to the nether
Who said you would need diamond to go to nether? I can enter the Nether with near-broken leather armour and an iron sword and return with two stacks of Nether Rack, a stack of quartz, 4 ghast tears, and 7 magma creams.
I used Iron as an example because it was quite weaker than diamond, so proving that comparing a generally used item (such as iron) and comparing it to the suggestion (such as this) is a lot more efficient than saying diamond or other powerful materials or items.