Mortal Shell - How to find Solomon, The Scholar and Eredrim, The Venerable Shells

To find Solomon, The Scholar and Eredrim, The Venerable Shells, you first you need head the grond floor of the Fallgrim Tower, in the same room as Sester Genessa who unlocks the abilities for the shells. There is a small crypt that holds all the shells in the back of the room and You can interact with the empty spaces to watch a short cinematic of the shells current location and after you own a Shell, you can swap between them.
1:44 Solomon, The Scholar shell is the closest one to get first, head out the door by Sester Genessa then head into the cave, run past the Griska boss then head down the small slope and crawl through a small tunnel to a small room with a Ghoul, just kill it and the Solomon, The Scholar shell is your. 3:36 To find the Eredrim, The Venerable shell head out the door by Sester Genessa then head into the cave, run past the Griska boss to the right side of the cave and crawl through a small tunnel to long path with a lot of enemies, just run past them all and make your edge of a cliff with a staircase then make your way down then you will see a bridge, the Eredrim, The Venerable shell will be sitting on the ground on the left in front of the bridge.
The Solomon shell is heavy Shell with high resolve and durability, but with middling Stamina and the Eredrim shell is a heavy Shell with high durability, but with very low Resolve and stamina. Solomon, The Scholar and Eredrim, The Venerable are two of the four Shells in the main game, if you find all four shells you will get the You Seem Different... Trophy /Achievement.
If you have The Virtuous Cycle DLC, you can get Hadern, the Deliverer shell after collecting all four weapons in the game. You can fight him one last time and he will use the Axatana, the twin blades that transform into an axe and after you defeat Hadern, you will get his shell and the Axatana.