The Onyx Axe is used for breaking wood-type blocks, such as logs, planks, Crafting Tables, etc. It can also be used as a weapon, dealing half a heart less damage than an Onyx Sword, but at a faster reduction of durability.
Onyx Pickaxes are used to mine ores and other types of “stone” or “metal” blocks. The Onyx Pickaxe has a mining level of 4. This mining level means the Onyx Pickaxe can mine all base materials in Minecraft (including Obsidian, but obviously excluding Bedrock), and most ores from other mods.
The Onyx Hoe can be used to till dirt and grass blocks into farmland, which can be used for growing crops. Using an Onyx Hoe to break blocks will not use durability, but the breaking speed will be as if no tool is used.
Onyx Swords are craftable weapons that can be used to damage mobs and other players. Swords have no damage penalty (thus, and Onyx Sword will do 2.5 Hearts damage), and only loose one durability point per strike in combat. Swords can also be used to break Cobwebs
Onyx Shears function the same as standard shears, however they have more uses (3116), but are made from a much, much rarer material. They can be enchanted with Silk Touch, which allows them to harvest Cobwebs .
Onyx Rods can be used to create an Onyx Bow, which, compared to the normal bow, has increased damage (even more than the Mythril Bow) and sets enemies on fire when they are shot, if the bow is drawn all the way back. It has 1000 uses.