As soon as you go inside the tomb, look for Leide and talk to him in order to get the sword. This event will occur shortly after Insomnia has been discovered and invaded. In fact, you will be able to get there while doing the 'Legacy quest', which is a vital part of the main story where Leonis will invite you to go to the tomb in order to listen to something there. The first-ever Armiger you will find is the Tomb of the Wise. However, some that are not and this makes them kind of tricky to find. In general, most of the Royal Tomb locations where you need to go are related to the main missions of the game, which makes them easy to get. Let's take a look at all the different locations where you can find the Armigers as well as the different stats they provide. If you manage to get your hands on all of them, you will earn the 'Fateful heir trophy' which is one of the rarest and most sought after trophies in the game. However, there is a price to be paid - using those weapons constantly drains your HP, which means that you need to do your calculations right because you might end up dead. What's more, Noctis is the only one who can use them, which makes them extremely powerful. This indicates that finding them is no easy task. There are thirteen of these Royal Arms in the world of Final Fantasy and all of them are hidden within the royal tombs. As you can probably guess, this means that it is a king-infused blade. One of them is the Armiger Weapons (a.k.a Phantom Weapons) made from the souls of Noctis' ancestors. There are many special items in Final Fantasy XV which have different effects.

Ffxv shield of the just location