Bukkit

Version 3.0
Complete system overhaul!
Upgrading only requires 1 altar now. However, you don't get materials back!
Detects all enchantments and their levels automatically.
Blocks upgrading enchantments past level 10 (X)
Added Fishing Rod enchantments!

Version 2.3.1
Fixed a small issue with the tier 1 altars not requiring all the blocks to be used.

Version 2.3
Fixed bugs with altars not opening. Updated pictures for altar formations will be put out soon!

Version 2.2
Fixed a major bug in 2.1 where only tier 1 altars could be opened.

Version 2.1
Updated to 1.8

Version 2.0
Finished pickaxes, shovels, axes, hoes, bows, armour, and fishing rods.

Version 1.2
Began adding Pickaxe enchantments
All the Altars should work now!
Swords have been finished (I think)
Change: Tier 6 is now back to stone blocks in the corner *applause*
Change: Tier 3's Top Most block (the block you click, used to be obsidian) is now a redstone block

Version 1.1
Added a GUI that allows players to select the enchantment that they want to upgrade
Added more enchantments to the list of available upgrades
Change: Tier 6 now has iron blocks in the bottom-most corners

Version 1.0
- Initial Release