Go into Seers Vilage and into the Elemental Dungeon

Go into Seers Vilage and into the Elemental Dungeon. The Commorb will turn into a Commord (thu). Use this onto a water elemental, andRuneScape gold it'll become a Commorb (wat), which you use on a fire extinguisher. Use the Commorb (earth) on an air elemental, then the Commorb (air) on a ground elemental.

Finally, go to the middle of the dungeon and the killerwatt will look, and you need to conquer it; it's lvl 100 and utilizes mage. This one needs 1 slayer. After you defeat it, it will dissappear and Ajiat will look. He will inform you that you need to conquer the Killerwatt, as if you don't, it is going to destroy the Warriors Guild. He will tell you to go to Aubury in Varrock.

Head to Aubury. He tells you that you need some White Knight equipment to defeat the Killerwatt. Purchase a scimitar and battleaxe, then head Aubury again. He'll teleport you to the Land of Lightning. When you get there, your armour is mechanically banked, except the Sword of Thunder and Aqua Scale. Equip both. Head to the water source on the minimap, but it is going to be a shock tap instead.

Then the Killerwatt appears. Put on Protect Melee. It is lvl 190 monster, but, fortunately, his maximum strike is 10, and he's got a minimal defence lvl. Use the exceptional Attack of this sword (explained later) and get him to half health. Then equip your scimitar andcheap OSRS gold get it into no wellness. USE your b-axe on it and he should die. Pick it up. There are now lots of people around now. Ajiat should be there. Speak with him and he'll congratulate youon killing it. He'll buy the Thunder Chainbody from you for 50k.