/tgtdeleg uses the Kerberos GSS-API to obtain a useable TGT for the current user without needing to know their password, NTLM/AES hash, or elevation on the host.
/ticketuser is the username of the user to impersonate.
/ticketuserid is the domain RID of that user.
/groups are the desired group RIDs (512 being Domain Admins).
/krbkey is the krbtgt AES256 hash. (info obtained earlier (KRBTGT secrets))