Mephisto is aar immune
Think everyone might be missing the actual reason.IMIW synergy only provides relief from Incinerate EFFECTS.And since during Aura, it is only Incinerate Damage while opponent is close, so Aura does NOT actually apply an Incinerate Debuff (effect) on opponent. (else game would constantly have to toggle that Debuff on and off as you move closer and further away from each other).Pretty sure you only see the icon for Aura on Mephisto himself, not any type of Incinerate icon under opponent.However, that Incinerate from his SP1, well that may actually be one that StealthSpidey might be able to reduce, **subject to all the above discussion about AAR**
I would look at blade and his interaction with Mephisto, he can prevent the aura but not the ticks.