If you want to stop the enemy the event has to be on the ground. That then makes the ground hot so the enemy can't walk acros it. This doesn't effect flying monsters (e.g Bat, Bee) or Bosses.
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If you want the SCE, add a genartor and it will releace a long-range blue flame.
Janus, I didn't try makeing it destroy blocks or enemys.
NOTE: Do not use this on multi player mode, if it kills someone it causes an access violaton.