Odd, the Damage effect can have splash without a Search Area effect. Probable cause is with copying your Art - Beam field has been corrupted on your Action actor, look for the 2 being in the wrong spot. Else your events are not refering to the new effect (maybe on the impact Site actors).
If that does not solve the problem upload the map so others and I can look through the problematic data tree.
My advice is make your own ability from scratch.
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https://www.sc2mapster.com/forums/resources/tutorials/179654-data-actor-events-message-texture-select-by-id
https://media.forgecdn.net/attachments/187/40/Screenshot2011-04-17_09_16_21.jpg
Check the Action type actor for the weapon. Make sure there are not several events leading to the actor creation each time it fires.
Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?
https://www.sc2mapster.com/forums/resources/tutorials/179654-data-actor-events-message-texture-select-by-id
https://media.forgecdn.net/attachments/187/40/Screenshot2011-04-17_09_16_21.jpg
Under the events there is one called Weapon Start while the Target - Impact Location - Value of the Damage effect can be set to target unit/point.
Also the action actor has a Sound - Launch sound field and the Art - Launch Model field
Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?
https://www.sc2mapster.com/forums/resources/tutorials/179654-data-actor-events-message-texture-select-by-id
https://media.forgecdn.net/attachments/187/40/Screenshot2011-04-17_09_16_21.jpg
Then alter the events so that it plays when the weapon animates or allow it to hit a target/point.
Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?
https://www.sc2mapster.com/forums/resources/tutorials/179654-data-actor-events-message-texture-select-by-id
https://media.forgecdn.net/attachments/187/40/Screenshot2011-04-17_09_16_21.jpg
Odd, the Damage effect can have splash without a Search Area effect. Probable cause is with copying your Art - Beam field has been corrupted on your Action actor, look for the 2 being in the wrong spot. Else your events are not refering to the new effect (maybe on the impact Site actors).
If that does not solve the problem upload the map so others and I can look through the problematic data tree.
Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?
https://www.sc2mapster.com/forums/resources/tutorials/179654-data-actor-events-message-texture-select-by-id
https://media.forgecdn.net/attachments/187/40/Screenshot2011-04-17_09_16_21.jpg
As the tutorial is too long winded for me to watch through, summarize how the weapon works.
Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?
https://www.sc2mapster.com/forums/resources/tutorials/179654-data-actor-events-message-texture-select-by-id
https://media.forgecdn.net/attachments/187/40/Screenshot2011-04-17_09_16_21.jpg