Constructor: Sets imageFile to “items/wands.png” and image to 13
onZap(): Deals damage and creates purple particle burst effect
fx(): Creates shadow missile projectile and plays zap sound
isKnown(): Returns true (wand is always identified)
emitter(): Returns PurpleParticle.FACTORY for visual effect
emitterInterval(): Returns 0.1f for particle emission rate
desc(): Returns string from R.string.WandOfShadowbolt_Info