Dghlcmugaxmgbm8gag9wzq Direct

Given the context ("helpful piece"), maybe it's just a that decrypts to something like "this is a test" or "helpful piece".

Given the symmetry, I’d guess the is that after applying Atbash, you get welcome to the puzzle or similar, but my quick attempt didn't yield that. dghlcmugaxmgbm8gag9wzq

The string dghlcmugaxmgbm8gag9wzq appears to be encoded, possibly with a cipher like Caesar cipher, Atbash, or Base64. Given the context ("helpful piece"), maybe it's just

Alternatively, maybe it's + ROT13 or a keyed cipher. Given the context ("helpful piece")