This door requires you dress up like three different people. The first outfit you need to wear is the Bright Plate Armour. The full outfit can be purchased in the Arena shop, or you can get the Leggings and Boots at the Knothole Glade shop, and the other parts from wandering traders in the Witchwood Lake area (try exiting, then re-entering the area until you get the vendor that sells the pieces).

The next outfit you should put on is the Dark Will User's Outfit. This can be found at the Darkwood Marshes demon door.

Finally, put on the Bandit Outfit to get the door to open. The Dollmaster's Mace from the chest inside.

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