Can an Aura be dispelled?

[Quatar]

Let's say I have a Nalfashnee Demon for example.

It has "Aura unholy aura (DC 23)"

Unholy Aura: http://www.d20pfsrd.com/magic/all-spells/u/unholy-aura

Especially this effect is nasty:
4. If a good creature succeeds on a melee attack against a warded creature, the offending attacker takes 1d6 points of Strength damage (Fortitude negates).

Now... can the caster of the group dispel that Aura? Or at least supress it? It's based on a spell but not exactly a spell, so I'm not sure.

Except for ranged attacks/spells, is there a good way to deal with that creature?

[darth_gator]

Based on what I'm reading, no. I see nothing that allows you to dispel a Supernatural ability, which Unholy Aura is.

[Eltacolibre]

You can only suppress it with an antimagic field but by the time you are casting antimagic fields, Nalfeshnee are not really a threat anymore, well at least a regular one.