I tested 1108 a while back and these are my guesses for how it works:

  • The spell has three endroll ranges: 101-120, 120-149, and 150+.
  • Within a range, it doesn't matter what the roll is. 150 is as good as 250.
  • 101-149 contains the results of the target running to a different room.
  • 120-149 contains the results of hesitating briefly.
  • 150+ is always either frozen or instant kills.
  • The instant kill rate on 150+ is about 20%. It's possible this depends on lore but I couldn't fixskill to test.
  • Telepathy lore modifies the thresholds so you can start getting the best results starting from 140-ish endrolls.