Creating Ultimate Weapon
Step 1: Make sure you have a Unique Weapon (Guardian, Historic, Angel, Legendary Golden, Bloody) or also known as green weapon
Step 2: Upgrade the Unique Weapon to +10
Step 3: Put it in the backpack "B"
Step 4: Log out and log in to the Control Panel then click the Make an Ultimate Weapon
Easy as that just follow the instruction and your ready to go