In bloodborne, if you set a password you could summon or be summoned by someone with the same password, regardless of level difference.
I've only seen this mentioned as being possible in ds3 on one sight out of numerous i've encountered. However, yesterday I was not successful in my friend finding my summon sign on a much higher level character using a password. I know we were able to group with the password, as I was able to jump on my lower level character and he'd find me immediately (with the same password).
Has anyone had experience with this? Are you able to group with a password regardless of level difference? Could I have just had bad luck with this attempt?