The Proxima Shell in Mortal Shell 2 is a powerful and fun shell to use. After obtaining it, you can farm money with it. To get the Proxima Shell, head to Widow's Cliff. Go straight from the upper-left corner until you reach a point guarded by a long-legged spider. Enter that area, and you'll find the shell.
How to Obtain the Proxima Shell in Mortal Shell 2