Auras of A2 mercs in different difficulties

[nukedood]

I was reading a short blurb on the differences in auras of A2 mercs throughout the different difficulties, but could not comprehend what I was reading.

What exact auras do combat/defense/offence mercs get in the different difficulties?

Can they get more than one?

[Olfmo]

no they keep the one aura they have when you hire them

which different auras there are you can read when you hire them...