There are really a lot of coins like you are looking for, their value can drop by 100% and can be called dead coins. These coins are shitcoins, pump and dump, if you invest in shitcoins cases like this are not too surprising.

Luna's case is different because it's the top coin, it's not like shitcoins are created in a few days and die later. Luna was built by a professional team with high utility and application, I remember correctly, Luna was developed from 2018 until it crashed. It has come a long way, no one would have thought it could collapse so quickly for a top coin with a billion dollar market cap.