I just checked my nepenthes and i found this as shown in the picture i was like what! i had this plant growing extremely well for almost 2 years now. all thats left is some basal shoots from the bottom. I dont know what the cause of this was it might be from root rot. As it is growing in pure peat and that doesnt drain much. It was my first nepenthes so i didnt know about the drainage part so i put pure peat. In which all my nepenthes now are grown in peat , spagnum, perlite. This is how it looks now.
Its getting worse and today its mostly all black. there is some mold /fungus growing on the dead stem.
This is how it looked just last month.