Oziach says that to be able to buy a rune plate, you have to kill the green dragon Elvarg, located on Crandor Isle. Oziach is located west of Edgeville and is very close to the wilderness. Ask him how to get a rune plate, and he will tell you to talk to Oziach. Talk to the Guildmaster in the Champions guild. 10,000gp is optional for a part of the quest. Items needed: 3 planks (found in wilderness), 90 steel nails (6 steel bars), an 'unfired bowl' (use soft clay on a potters wheel and make a bowl), a wizard's mind bomb (bought in Falador's bar for 2 gp), a lobster pot (bought from Port Sarim's fishing shop for 20 gp), a piece of silk, an anti-dragonfire shield (obtainable from the Duke of Lumbridge), and a scimitar or battle axe. Level 40 defense, strength, and attack is a must. Requirements: Capable of entering the Champions Guild, capable of defeating a level 83 dragon, level 8 crafting, level 33 magic (optional), and level 34 smithing. Starting Point: Talk to the Guildmaster, located inside the Champions Guild. Kill the mighty dragon Elvarg of Crandor Island and earn the right to buy and wear the powerful rune plate mail body.

Blue dragons old school runescape