This section of Assassin's Creed: Odyssey walkthrough includes the information of tombs located in Argolis. Below, you can find a detailed description of how to complete the tomb and what weapons you can find there.
Tomb location: Argolis, the northern part of the location.
Walkthrough: Enter the tomb. On the left-hand side of the room, you will find a pathway that will take you to another room. Inside, you will find a blocked passage. In order to unlock it, hit it. This way, you will be able to get to the other side.
Continue, and then turn left. Go downstairs. You will reach a room with a puzzle.
You have to move the shelf towards the wooden stakes blocking the pathway. When moving the shelf, watch out for multiple traps set out in the room.
After you place the shelf in the right place jump onto it and them over the stakes.
In the next room, you will find a chest that hides the Ancient King's Helmet. It is a regular item, though - if you have legendary armor, this helmet is not worth your attention.
Continue to reach a room with a board. You complete this tomb by activating it. On the left-hand side of the room, you will find a passage to another location. Inside, you will find another chest hiding the Heavy Bow.
Tomb location: central part of Argolis.
Walkthrough: Enter the tomb and smash the planks blocking your way. This way you will reach another room. Inside, watch out for multiple traps on the floor. Jump over and avoid them until you reach the end of the path.
Continue to reach a fork. To the right, you will find snakes. Kill them, and continue rightwards. Smash the vases blocking your way and continue forward.
You will reach a chest hiding the Brawler's Armor. There is a passage behind the chest. Smash it and continue forward.
In the next room, you will find a board and an exit route. For completing this tomb you receive 1305 experience points.