Ultimate Fist Mod 1.8, 1.7.10 is a really overpowered tool that destroys everything and kills everything in one hit. Obsidian still takes some time to mine but, it is a lot quicker and I think Iron Golems will take two hits because of their massive amount of health.
How to install Ultimate Fist Mod 1.8, 1.7.10
Download Links for Ultimate Fist Mod 1.8, 1.7.10
For Minecraft 1.5.2
For Minecraft 1.7.2
For Minecraft 1.7.10
For Minecraft 1.8