Aura (enhancement)

B102 instructions say to see B262 on how to write up.

Breakdown

Requires but does not include Melee Attack, so if you included that, the net effect is like +50.

It does appear to include Cannot Parry (normally -5%) though so the net effect is more like +35%.

Interaction with AE

this was added in 2009 sometime between April 14th and May 1st

http://www.sjgames.com/gurps/faq/FAQ4-5.html#SS5.2.8 discusses as a "free attack" effect and stacking Area Effect on this

An actual radius would amount to adding Area Effect on top of it all. That might not be "canon," but it's logical and the simplest way to do it.

This appears to be derived from a 24 August 2006 PM that transmetahuman mentioned on 12 December 2006:

Powers states that an always-on damage field requires Aura (+80%), Always On (-40%), and Melee Attack (-30%). That's a range 0, "if I touch you or you touch me" type of thing. An actual radius would amount to adding Area Effect on top of it all. That might not be "canon," but it's logical and the simplest way to do it. So a 4-yard field would add Area Effect 2 (+100%) and the net modifier would be +110%. I don't see any conflicts: Aura covers the "free attack" effect, Always On addresses the "constant effect" angle, Melee Attack takes care of the "ground zero is at range zero" element, and Area Effect handles the "blankets an area" aspect. You can omit Always On -- for a net +150% -- if you want it to work like an ordinary Aura that you can switch on and off. The other aspects don't seem negotiable.

However, this in turn appears to resemble a post that TMH made a month before receiving the PM on 31 July 2006:

By the book, an Aura has no Area Effect associated with it, so Selective Area is meaningless. I guess a GM could let someone use the same cost for a variant enhancement that let you select among those you're in contact with, without having to turn the Aura off and on, but that would be outside the bounds of what the book says.

Likewise, the GM could let you take Aura and Area Effect (and either Melee Attack (to fit the wording of Aura), or Emanation (which I think is more appropriate for Area Effect) to make a continuing field around you that affects anyone who comes within x yards of you. Again, the books don't address that.

The "might not be" turned out to be "is" because this was canonically used in Aura of Power:

May 2010 Pyramid 3/19 page 4-
March 2012 Power-Ups 4 page 4

Supers

GURPS Supers page 44 has Electrogenesis as an example where Aura is applied to Create.

Quotes

PK quotes

2006 http://forums.sjgames.com/showpost.php?p=195927&postcount=15

Aura turns your transient attack ability into a switchable one. Aura is a requirement for Always On because you cannot take Always On on a transient ability, only a switchable one.

Aura by itself does not reduce your range, but it is incompatible with any sort of normal ranged attack, and thus requires the Melee (or, one would assume, Emanation) limitation.

if you want a character whose firey aura fills up the two yards around him, I would buy it as Aura, Area Effect 2 yards, and Emanation

2006 further http://forums.sjgames.com/showpost.php?p=195996&postcount=19

If you're going to use Area Effect with Aura, it's my opinion as a GM that you should use Emanation instead of Melee, C, because the latter is a bit of a crock.

Kelly re Kromm

a 2007 post http://forums.sjgames.com/showpost.php?p=411352&postcount=9

Kromm has actually said that Area Effect is appropriate for expanding the range of an Aura.

Indicates a pre-2008 post also exists prior to the 2010 one, needs to be located

http://forums.sjgames.com/showpost.php?p=1037048&postcount=17 in 2010

Aura + Area Effect means that the ability keeps firing off every second. That means that every person in the area has to make a HT roll every second until affected.