The act 2 mercenaries..

[eXonyte]

Ok im wondering which one casts the "might" auara thing..im pretty sure its the offensive because defensive casts defense, combat casts attack rating...............But when i get the offensive mercenary from act 2 it doesnt seem to give me anything..when i hear it cast i look and nothing seems to have changed. Isnt it supposed to give more dammage?

[Evrae Altana]

The one with the Might aura is the Offensive one. Make sure you hire him in Nightmare difficulty.

[eXonyte]

Oh, nightmare? it only works if you hire them in there? okay thanks :)

[MaxMax]

See "The Arreat Summit" for a complete list of A2 mercenaries auras
http://battle.net/diablo2exp/basics/hirelings.shtml

[TeknoRat]

Also sometimes it will take awhile for the aura to activate as the merc has to "activate" it himself.