How do you open dragonslayer shop without quest?

To open the Dragonslayer shop in the game "Old School RuneScape" without completing the associated quest, you need to have the required items in your inventory. Specifically, you must bring a completed Dragon Slayer quest item, such as a green dragonhide body, to the shopkeeper, who will then allow you access to the shop's items. Additionally, you can also gain access by using a certain in-game item or by meeting specific requirements set by the game developers, depending on any updates or changes made after my last training cut-off.