A video guide showing how to complete the quest the sword in the waterfall on final fantasy 15 xv.
Sword in the waterfall locked door.
Costlemark tower locked door 99 recommended this dungeon adds a twist once through the locked door you can t use any items so before you even consider entering there are a few things to do in.
At the hotel talcott will tell you about a legendary sword hidden behind a waterfall nearby.
Ronin is weak to swords daggers lightning and royal swords but due to his location it s easy to fall off the ledge into the area below so if you do find yourself knocked out of the area try to.
When you approach the dungeon locked door the game will only tell you it s locked it will probably drive you insane thinking about how to open these.
Check in with all the diners to get the points of interest well marked.
Defeat the staldra enemies in this room and then run through the door at the north end.
It may be one of the royal tombs so it s worth checking out.
Run over to the north end of the room and use the small key on the locked door.
When you first find them you won t be able to open them.
There are secret doors at the end of many dungeons in final fantasy xv.