Lesser Demon Champion's scroll

The lesser demon champion's scroll is a very rare drop obtained from a Lesser demon when killed. It is a challenge from Lesser Demon Champion. By bringing this scroll to Larxus in the basement of Champions' Guild, you may fight the champion in the Champion's Challenge distraction and diversion.

A ring of wealth has no effect on the chances of obtaining this scroll as a drop, although a Champion scroll enhancer does. When in your inventory, the enhancer gives a 20% higher chance of receiving a scroll. The enhancer has 250 charges to start with, and one charge is used whenever you kill a creature that has a chance of dropping a champion scroll. It will disappear when all the charges have been used up.

No armour or weapons are allowed inside the Arena when you fight the Lesser Demon Champion, meaning that only bare hands may be used. Food and prayer potions are allowed. The scroll reads "Come to the Champions' Guild so I can banish you mortal! Champion of Lesser Demons."

Strategy
The best way to obtain this Champion's Scroll, along with the Imp Champion's scroll, is by entering the Karamja Volcano Resource Dungeon and using a Dwarf Cannon. Simply set it up in the middle of the Dungeon and it'll target all Lesser Demons and Imps nearby. This will make the Lesser Demons attack you and will also often one-hit kill the Imps.