Not sure what you mean with "A wide array of unique bosses that drop rare, uncraftable equipment.[/i]".
Maybe i could help you out with that, i got a very efficient Item Rarity System.
If you give me Credits i'll give you the Source Code.
Since this doesn't look like a real "mod" i'd suggest creating an own MC Version (Not a Forge Mod, an own .jar file) of it.