LVL 46 enchant. Efficiency 3. :colonveeplusalpha:
You think that's bad? Well I made a level 50 enchant (it's pretty hard to get randomly), and all I got was Unbreaking 3. I don't even need durability with the amount of diamonds I have stuffed in my chests. To add insult to injury, leveling in single player is pretty hard and time-consuming with only one enderdragon in the End. And yes, this was from the 100 levels I got after killing it.
Efficiency 3 on a diamond pickaxe is pretty damn nice, actually. It digs faster than a shovel (in fact, it's almost creative mode fast in most cases, meaning dirt and gravel breaks instantly) and chops trees as fast as an axe. I got it while making a level 20 or something enchantment on a diamond pick. I hate the random number generator in this game.
Silk Touch is an enchantment that allows mined blocks to drop themselves. Meaning, you can get certain blocks that cannot be normally obtained: Diamond ore, Coal ore, Redstone ore, Grass, Mycelium, etc. You can even mine up glass blocks without them being destroyed!
And, more importantly, mob spawners! Just think of all the delicious possibilities for player-made dungeons. Or tiny grinders which you can place at your home and which grind you some rotten flesh, or arrows, while you are around, minding your business.