Making Berserker necklace (Cosmic rune, Fire rune, Earth rune)

Making Berserker necklace (Cosmic rune, Fire rune, Earth rune) in OSRS: 1 × Onyx necklace, 1 × Cosmic rune, 20 × Fire rune, 20 × Earth rune → 1 × Berserker necklace. Profit right now: -329,094 gp after GE tax (input cost 2,443,882 gp).