You can use a Free Action when you deal damage with the weapon to deal Psychic damage instead of the weapon’s normal damage type.
When you deal Psychic damage with the weapon, you can spend 1 charge of Inspiration or Mana Flux to inflict the Fear 1 condition on the target, which lasts until the end of your next turn.
When you deal Psychic damage with the weapon, you can spend 2 charges total of Inspiration and/or Mana Flux to inflict the Stunned 1 condition on the target.