How do I add damage to a normally harmless projectile?

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I'm trying to make a radio wave that damages players and I'm not sure what to put in where.
Oh, and how to make it use a certain image when it kills someone, instead of just a red arrow.

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DirectDamage = 60; will make a projectile deal 60 damage. It must be in the projectile data lock, though.

Look at weapon-gun's cs file for addDamageType. That is where you add the special CI, or the image that appears in the chat when you kill someone