Instructions
Create a new character in the Berserker class.
Raise your character's Attack and Strength levels as much as possible on Tutorial Island. It is beneficial to raise Ranged and Magic as well, but focus primarily on Attack and Strength.
Complete all of the main Berserker job quests. There are roughly 50 quests. Be aware that most quests are long and time-consuming. At the end of the main storyline, your Berserker will be at an extremely high level.
Raise your Attack to 78, Strength to 99, Ranged to 99, Prayed to 95, Magic to 99, Slayer to 50, Firemaking to 71 and Hunter to 61.
Raise your auxiliary skills to the following: Fishing 62, Fletching 50, Crafting 70, Woodcutting 60, Mining 64, Thieving 66, Runecrafting 50, Cooking 70, Smithing 70 and Farming 35. You should achieve all of these levels in the main storyline. Grind in high-level areas if you are lacking some points.
Purchase or obtain Void Ranger armor, the Fire Cape, Barrows Gloves and Berserker Ring. The equipment complements the Turmoil Berserker statistics.