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Damage all enemies around it, then mark those enemies as "hit" (so they don't get hit more than once).
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bro help me, how can I mark the enemies as hit ? I have done what you said, every .03 seconds move a dummy to the targeted area as a missile, but when I make it deal 150 damage, it deals 150 damage per 0.03 seconds. How can I mark them as hit ?so they wont be hit again.
For a better understanding, here is your post (full) and my question:
http://www.hiveworkshop.com/forums/world-editor-help-zone-98/standard-abilities-custom-damage-252412/
You say
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Uh, you could have a dummy unit follow the shockwave missile and damage enemies in the area.
To be a bit more specific:
Create a dummy.
Move it towards the target location every 0.03 seconds at the same speed as the missile.
Damage all enemies around it, then mark those enemies as "hit" (so they don't get hit more than once).
When it reaches the target, remove the dummy.
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