So I'm running a game of Shadowrun in which the players will soon get a rather powerful initiated mage. What I'm curious about is this:
Are there any attacks/threats that affect basically all characters equally in Shadowrun?
In addition, I'd like to have it work on a foe who is powerful enough to face the party alone as well (someone with high Body, for instance, or magical protection) without necessarily killing the party if they get hit with the crossfire.
I'm talking about stuff that will really be effective equally-the characters will be along a wide discrepancy of power, so I don't want anything that will let the troll survive but overkill the technomancer. Something scalable would be nice, so it could function as a warning shot (everyone takes one point of physical damage!) or as a TPK (and now three hundred more!), though I probably won't use it as such.
EDIT: Let's make this a little bit simpler:
Things which are scaleable and that nobody's likely to throw more than ten dice in damage resistance against, unless they're really specialized for that purpose. No magic, since counterspelling can really ruin that quick.