Things this mod adds:

Lapis Lazuli, Redstone, Amethyst, and Emerald armor, tools, and weapons (can be used for armor, tools, and weapons; Amethyst is extremely powerful, but has low durability)
Endersteel, a new metal found in the End dimension (can be used for armor, tools, and weapons)
Megatite, the strongest material in the game (can be used for armor, tools, and weapons)
Ruby, found in the earth (can be used for armor, tools, and weapons)
Tin ore and Tin blocks (cannot be used for armor and weapons)
Platinum weapons, tools, and armor (They have some special abilities...)
Titanium weapons, tools, and armor (They have some special abilities...)
Rose Gold weapons, tools, and armor (They have some special abilities...)
The Forge block, which can be used to combine metals into even more new metals.
Knights which spawn to provide a challenge for people with high level armor
The Rainbow Sword, a super powerful weapon (40 damage) which can be right-clicked to summon lightning. (Costs almost all of the metals listed above, in block form)

Forge Recipies:

Combine Tin and Copper to make Bronze, which you can use for tools, armor, and weapons
Combine Iron and Coal to make Steel, which you can use for tools, armor, and weapons
Combine Gold and Copper to make Rose Gold, which you can use for tools, armor, and weapons (With some special abilities).

Knight: Basic, easy to kill, drops a piece of bronze. Wields Bronze sword
Ice Knight: Spawns only in Ice Spikes and snowy biomes, is hard to kill, and drops blue ice. Wields Lapis Lazuli Sword.
Diamond Knight: A formidable enemy, drops a diamond and wields a diamond sword
Warden Knight: A super strong boss-knight which spawns a warden upon death. Drops an Endersteel block and wields and Endersteel sword.

If you want to give feedback, report bugs, or suggest ideas, email me at thingythingy59@gmail.com