.ban <user> [<reason> <--rm days>]
Bans a user and removes their messages from a specified number of days previous,
and log it to the channel specified in channels.bans.
To specify a number of days, pass the argument --rm followed immediately by
the number of days you want to specify, for example --rm 7 to delete messages
from the past week. This can be included anywhere in the arguments after the
user is tagged.
If there isn't a number of days specified, use the in banMsgDelete field from
the config.
You can unban a user with the unban command.
['BAN_MEMBERS']