EarthBound:Status PSI weakness value

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A status PSI weakness value is a type of one byte value ranging from 0-3 used in EarthBound's Enemy Configuration Table. It describes how often PSI Flash, Paralysis, Hypnosis and Brainshock will work on an enemy.


PSI Flash, Paralysis and Hypnosis use this table:

Value Effectiveness
00 99% (255/256)
01 50% (128/256)
02 10% (26/256)
03 0% (0/256)


The effectiveness of Brainshock is defined as:

  • 3 - Effectiveness of Hypnosis

For example, an enemy with a Hypnosis/Brainshock value of 1 would be affected by 50% of Hypnosis attempts and 10% of Brainshock attempts.