Here is an example of how the game describes another spell that affects all allies around the caster:
[...]
Now THAT is a good description. It's clear, there's no confusion. It's just missing the radius, but that's fine.
Now compare that to Evasive Aura, which also applies an effect to all allies around caster:
That is not how Aura skills work. An aura skill is not applied on anyone but yourself. But the Aura has an extra effect which is applied to matching target characters within range and will wear off as soon as they are no longer in the Aura skill's range.
E.g.: You cast evasive aura. Fane is in the Aura's range but Ifan is not. If you now run closer (and close enough) to Ifan he will benefit from the Aura despite not being in its range when you were applying it. If Ifan was quite far away from Fane and he is no longer in the range of your Aura, he will lose the Aura bonus he initially had.
-> An Aura is a passive AoE buff applied in real time around whoever's the Aura's center.
Hint: There are foes in this game with permanent evasion or reflection Auras. Get on high ground and teleport them 30-60 meters away (rude!). This should give you one or two turns without any of their allies being affected by those mean, mean Aura buffs.
The issue I see is, that I don't remember there was a tutorial message going up when (first) encountering an Aura. It should explain how Aura skills work. That way you'd have some clarity and you could avoid lengthy skill descriptions. Without such a tutorial I agree that the skill description should be extended to properly explain the skill functionality.
In general I join your wish for more accurate skill descriptions. As well as a somewhat more in-detail description of the undead perk: In which cases does health gain count as "healing", therefore turn into damage, and in which cases does health gain not count as "healing", thus remain healsome? (Such as necromancy and mosquite swarm; maybe they even used a different terminology for those so it is implicitly already implemented in skill and perk descriptions; not able to check right now.)
But I also see the advantage of keeping skill descriptions concise, avoiding redundant information. It should not be necessary to mention, that a skill such as crippling blow requires you to be in melee range of your target. Right now there's too much avoidance of information though, so some descriptions are rendered lacking information. Maybe the developers will adjust that, when they're going for gameplay enhancement patches in some weeks or months.
