So you really want the fire cape, do you? Well, here's how to do it.
First off, talk to the Gnome Trainer located at home. He can teleport you to the "Fight Caves"
When you click to teleport to the Fight Caves, you'll be sent outside, next to the bank so you can stock up. Click on the cave entrance to enter.
When you enter the cave, you'll be sent straight to Jad. Don't worry, no 63 waves to go through, just Jad
Tz Tok Jad
Jad has three attacks - Ranged, Magic, and Melee, all of which can 1 hit KO you. You need to know what to listen and look out for!
Magic: Jad will lift up his front two legs with a ball of fire in his mouth. You can hear this sound effect as a sizzling sound.
Ranged: Jad will slam his front two legs on the ground with a banging sound. You can hear this as a banging noise.
Melee: Jad will swipe a claw at you.
When Jad is at half health, he will summon 4 healers. If you do not kill/aggro all of these, they can heal him to full health continously.
Kill Jad, and get your cape!
Good luck, and hope this helps!