A sudden massive shift in the local ambient selyn fields created by a very high field Gen (usually a Companion or Donor, most especially the Firsts) who has learned the somewhat obscure and difficult technique of using his/her field as a weapon against Simes as Ancients might have used an Electromagnetic Pulse (EMP) as a weapon against electronic equipment.  A Genslam can startle, shock, derange, incapacitate or even murder a Sime.  Not all Gens can learn this technique and even those who have learned it might not judge the vulnerability of the Simes or channels in the vicinity correctly.  Such a mistake can be extremely unfortunate for the Gen.

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