So... I spontaneously forgot parts of my passphrase to my bitwarden vault which sucks. As I believe to remember most parts of it I hacked up a cracker, hoping against hope, to find the lost parts and gain my vault back.
I hope this is going to work.
You need the stored keyHash for the target vault which can be found e.g. in
user@system:~$ python3 bw_brute.py -e firstname.lastname@example.org -w wordlist.txt -k keyHash
user@system:~$ python3 bw_brute.py -h usage: bw_brute.py [-h] [-j WORKERS] -e EMAIL -w WORDLIST -k KEYHASH bitwarden master password bruteforce -h show this help message -j WORKERS workers to start -e EMAIL email address -w WORDLIST wordlist -k KEYHASH bitwarden keyHash