Answer: Social Identity Theory
Step-by-step explanation:
Social identity theory states that our perspective of who we are is affected or influenced by the group to which we belong i.e if we regard our group as the greatest and more influential group then we will also feel that we are the greatest and influential individuals. We may start using words like 'we' 'us' refering to our group including ourselves and this tends to give us a sense of pride and boost our self esteem. Anyone who is not part of our group we refer to as 'them' which brings the terms of in-group and outgroup which the in-group are those who belong to our groups and outgroup are those who doesn't.
This makes us tend to exaggerate our differences to the outgroup and we may start to think we are too great ,too powerful than those who isn't part of 'us'.
Auaruna is doing the same thing exaggerating the power of his in-group die to social identity it gives him personally.