BLUF

Narcissists are experts at manipulation and exploitation and do not understand how debilitating their behaviour can be for other people.

Summary

Narcissists lack empathy, and need to feel superior to other people. A narcissist wants things done their way, and they want it done now. Narcissists often achieve professional and personal success and still not understand how their behaviour affects other people's morale and self-worth.  Narcissists generally lack the following traits;
The lack of the above traits can also help explain why narcissists' consistent attempts in the workplace to exploit you can be so exhausting. A possible solution is to refuse tasks in the most non-confrontational way possible. Acknowledge that the task is important, and suggest to your narcissist boss a more reasonable timeline for completing that task.