The best replacement for killswitch is nemesis.

The best alternatives to killswitch are rated as following:
★★★★★  nemesis
★★★  baby killer
★★  chillswitch
★★  soda slope
  unprettier

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Speaking about killswitch, one probably shouldn't forget about jesse leach.

Other search terms related to killswitch and their ratings are:
★★★★★ jesse leach
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killswitch
nemesis
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