Suppress or Target Fear Aura?

[kbob]

The following question, though specific to the Death Knight's (dk) "fear aura" (fa), answers more generally the extent one can control one's own continuos su.
Can a dk suppress his su fa or at least target who it effects?
The description is as follows:
"Fear Aura (Su): Death knights are shrouded in a dreadful aura of death and evil. Creatures of less than 5 HD within 15 feet of a death knight must succeed at a Will save (DC 10 + 1/2 death knight's HD + death knight's Charisma modifier) or be affected as though by a fear spell cast by a sorcerer of the death knight's level."

I would think it would need to be at least one or the other, if not, both (suppress/target). My reasoning for this is his "undead followers" (uf) ability. Basically, uf allows the dk to attract undead followers as the name suggest, some being pretty low in HD. Undead are not immune to fear (unless specifically stated). The undead the dk attract are not immune to fear. So it seems that given this, either his followers would have to stay at least 15' away or save vs fear. I would think they would be not targeted or at least he drops it. Targeted makes more sense tho suppressing or both could logically work. If this is the case, would that mean that other continuos su for other creatures would be able to be suppressed or targeted?

[Zaq]

Unless there are houserules in place, undead are immune to mind-affecting abilities, and fear abilities are mind-affecting.


Undead Type

Undead are once-living creatures animated by spiritual or supernatural forces.
Features

An undead creature has the following features.

12-sided Hit Dice.
Base attack bonus equal to ½ total Hit Dice (as wizard).
Good Will saves.
Skill points equal to (4 + Int modifier, minimum 1) per Hit Die, with quadruple skill points for the first Hit Die, if the undead creature has an Intelligence score. However, many undead are mindless and gain no skill points or feats.

Traits

An undead creature possesses the following traits (unless otherwise noted in a creature’s entry).

No Constitution score.
Darkvision out to 60 feet.
Immunity to all mind-affecting effects (charms, compulsions, phantasms, patterns, and morale effects).
Immunity to poison, sleep effects, paralysis, stunning, disease, and death effects.
Not subject to critical hits, nonlethal damage, ability drain, or energy drain. Immune to damage to its physical ability scores (Strength, Dexterity, and Constitution), as well as to fatigue and exhaustion effects.
Cannot heal damage on its own if it has no Intelligence score, although it can be healed. Negative energy (such as an inflict spell) can heal undead creatures. The fast healing special quality works regardless of the creature’s Intelligence score.
Immunity to any effect that requires a Fortitude save (unless the effect also works on objects or is harmless).
Uses its Charisma modifier for Concentration checks.
Not at risk of death from massive damage, but when reduced to 0 hit points or less, it is immediately destroyed.
Not affected by raise dead and reincarnate spells or abilities. Resurrection and true resurrection can affect undead creatures. These spells turn undead creatures back into the living creatures they were before becoming undead.
Proficient with its natural weapons, all simple weapons, and any weapons mentioned in its entry.
Proficient with whatever type of armor (light, medium, or heavy) it is described as wearing, as well as all lighter types. Undead not indicated as wearing armor are not proficient with armor. Undead are proficient with shields if they are proficient with any form of armor.
Undead do not breathe, eat, or sleep.




Fear

Spells, magic items, and certain monsters can affect characters with fear. If a fear effect allows a saving throw, it is a Will save (DC 10 + ½ fearsome creature’s racial HD + creature’s Cha modifier; the exact DC is given in the creature’s descriptive text). All fear attacks are mind-affecting fear effects. A failed roll usually means that the character is shaken, frightened, or panicked.

Emphasis added.