So I thought it would be neat to have an edge similar to Spiderman's "Spider Sense." Of course it couldn't be nearly as effective or trustworthy as the real thing is, because that would upset game balance.

Has this already been done?
Can anybody create an edge similar to, or inspired by "Spider Sense" that would be acceptable in most games?

EDIT:
Clarification

This would be applied to an *existing* *mundane* character, through the application of *karma*

Sixth Sense? Combat Sense? I'd even allow Divination.

purchasable by karma as an edge for a mundane?

See the Lightning Reflexes edge.

Anything that boosts Reaction either directly or for purposes of Surprise Tests is a "spider sense." An edge that allows you to use Rule of Six on Surprise would also be a possibility (ie, roll a 6, get a success and a free reoll), though it should be a hefty Edge before I'd considered allowing it. An Aptitude in Surprise Tests (as opposed to a Skill) might also be an interesting possibility.

I know this thread wasn't for exact specs, but I'll do this anyway. Spider-Sense has been used for a butt load of things, this is a list of physad powers (cannon and non) that I'd combine for accurate Spidey Sense:

Blind Fighting
Combat Sense Level 3
A limited form of Empathic Sense
Magic Sense
Like 5 or 6 levels of Sixth Sense
Probably a couple levels of True Sight as well.

It's even demonstrated some SONAR capability, so the SONAR power from the Adept's Handybook could be applicable, though that's non cannon.
Also the Melee Sense power from the handybook would be countable too, also non cannon.

Only for Initiative (and then is horrible because it gives you a +1 TN on everything you do -- irk). A variant for Surprise Tests would actually have a more profound impact since Surprise Tests have a set TN of 4 in most situations. The Rule of Six was just the means of determining when you'd get a free chance to make another success; it wouldn't function in the same way as the standard RoS.

This would be applied to an *existing* *mundane* character, through the application of *karma*

In that case why are you asking about Edges? Edges can't be purchased with Karma (though Flaws can be bought off with Karma and GM approval).

The only other logical option is to go with a Martial Arts Maneuver. Maybe one that lets you add half your Skill level to Surprise Tests or something, but then requires you to use that skill as part of your action if you win Surprise. An Iajutsu-style art might be a good example of one that would include this maneuver (along with a Quick Draw maneuver).

You pretty much have your answer then.

* Lightning Reflexes
* Aptitude (Surprise Tests) [requires GM approval]
* Adrenaline Surge variant for Surprise Tests [requires GM approval; recommended against]
* Anything else that boosts Reaction directly or for purposes of Surprise Tests

Canonically speaking, Lightning Reflexes is your only recourse. That or boosting both Quickness and Intelligence.

A couple of suggestions have already been made to that affect, too.

Spidey sense is actually almost visual and his sense makes him suddenly leap into action without really thinking about it to commonly dodge something that would otherwise cause severe damage to him.

This would be like sixth sense in a way, but what Spidey Sense really applies to is surprise.

The ability to be standing with your back to someone who is sneaking up at you with a katana and sense them in almost a visual sense when they start bringing the sword down in an agressive release of energy that threatens "spidey"

That's basically what he picks up on. Agressive release of energy that threatens him.

Sitting in a room and suddenly dodging behind something a second before the door bursts open with gun fire.
Stuff like that are similar to the spidey sense.

I'd pretty much favor that a mundane wouldn't have such an ability because being mundane would kind of suggest that there is nothing special about the person.
Second, magic is pretty much how shadowrun would describe "super powers".

so this would most likely fall under adpets and could be a power that allows the adept to add dice to their Surprise test, which in turn would allow them to have a higher chance of not being surprised like everyone else, which in turn would allow them to get the hell out of the way of what ever was comming up.

But basically...this has already been done with Combat Sense, since Combat Sense allows you to add 1/4, 1/2, or Full amount your dice from your Combat Pool to your Reaction Test.
So, have Combat Sense, good Intelligence, good Quickness, and good Willpower to give you a good Combat Pool and you've got your spidey sense.

If you have a 6 in all of those attributes, you will have a Combat Pool of 9.
Combat Sense level 1 gives you +1 to that pool making it 10.
1/4 of that pool would be 2 dice.
Your Reaction would be 6 (Intelligence + Quickness / 2)
So your surprise roll would be 6D6 + 2D6 (or 8D6)

At level 3 you would have a surprise roll of 18D6
6D6 Reaction
(10D6 Combat Pool + 3D6 from Combat Sense) = 12D6
12D6 augmented Combat Pool + 6D6 Reaction = 18D6

Go Spidey Go!

Which if im not mistaken would close to imdaiately refresh as most Suprise tests happen before you roll for iniative........

I never liked the idea that you couldn’t by edges in game. Many of those edges are ones that can be learned. Eg, home ground, resistance to pathogens (I acquired this one while living in Indonesia), collage education, technical school education, connected (just make the right friend), good looking and knows it, human looking. Those re the ones I can justify easily (the last two may require surgery). I think they should be allowed at a similar karma and effort cost to riding yourself of a flaw subject to GM aprovel of eth individual edge.

For this specific question would recommend lightning reflexes perceptive and a high int. aptitude in surprise tests would also be useful but is not canon.

Edward

Don't forget though, that Spidey Sense has been used to alert him of creaky floors when he was trying to be sneaky and the like. From a comic point of view, I'd say it's a limited for of cosmic awareness, with the subconcious mind at the controls...good luck translating that to Shadowrun while maintaining a balance.