The goal of this addon is to provide a more interesting gameplay for those who want a challenge. Here is what was changed:

Recipes

• There were several changes to tool and armor crafting
• Axes now require 2 axes of the previous level, EXCEPT you need gold to get diamond.

• Pickaxes also require two pickaxes of the previous level

• Swords will now require two of the previous sword level EXCEPT in the case from iron to diamond, in this case you need gold tools first.
   

• Armor uses ingot BLOCKS instead of just ingots.

Mob spawns

• There were also a few changes to mob spawning.
• So far only zombies have actually seen a change, they now spawn in larger groups.
• Eventually this will be fixed, there seems to be a small bug.

Mob Damage & Mechanics

• The damage dealt by mobs has been DOUBLED. There are only a few exceptions
• Phantoms were unaffected by any changes as they are annoying enough as they are
• The Wither was not changed, as it is already OP
• Creepers do NOT do double the damage, as they EXPLODE. Creepers have DOUBLE the explosive power, same with charged creepers.
• Zombies ALWAYS see you, even through blocks
• Zombies and Skeletons no longer burn during the day

• In-game screenshot of zombies in action...MULTIPLAYER RECOMMENDED!!!
   

V2

• Added brass, zinc, brass tools, brass armor.
• Brass items have a mining level of stone but are more durable and are a bit faster.
• Brass armor does not break (have not figured that out yet) and has 10 total protection out of 20, but also has a little knockback resistance as well.
• Brass armor is crafted similarly to the way diamond armor was crafted BEFORE changing.

• Brass tools still have a slightly different recipe than normal
• Brass sword also has a different texture than vanilla swords

• Brass is crafted with 6 zinc and 3 copper. Must be smelted before it can be used.

• You can find zinc ore underground below y-64. Here is what it looks like.

V2.1

• Now you can also get bronze and bronze items. I substantially reworked brass creation mechanics and brass items.

• Brass sword^^^
• Bronze sword vvv

• Tin ore texture is temporary, feel free to suggest tips.
• Bronze items are tiered between iron and diamond. It provides a little more armor than iron and has a little knockback resistance. It also has 500 durability. Still trying to get armor durability to work.