The entire staff (CAs included) are immune to the /ignore command. As a good practice, if someone contacts you claiming to be a GM, immediately issue a /ignore on their name. Issuing /ignore Oracle in chat results in "You may not ignore Oracle." and thus is a trusted person to talk to.
Another way is to attempt to give the person a negative reputation in a settlement, the game will tell you:"please make sure that <staffmember name> is a normal player."
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[[Category:Babel/G]]