Hit them in the head!

Mind Crush one-action Spell 6

Manipulate Mental
Traditions Occult
Range 60 feet; Target 1 creature
Defense Fortitude; Duration instantaneous or permanent

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You crush your enemies mind possibly permanently reducing its ability to act. The effects are determined by its Will save.
Critical Success The creature is unaffected.
Success The target takes 4d6 mental damage.
Failure The target takes 8d6 mental damage
Critical Failure The target takes 8d6 mental damage and is permanently slowed 1. The effects of this curse can be
removed only through effects that target curses. The target can be subject to this spell again, but can not increase its slowed condition due to critically failure again.

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Thoughts?