SC2Mapster

I assume you are referring to the point defence drone? (Because I believe those don't return)

I think I have found a workaround by using two separate launch missile effects, missile ammo units, missile actors, and attack action actors.

However, for some reason, the art is launching from the wrong point on the return effect. It appears to be launching from the starting location of the caster unit. It needs to be launching from the target point (source point from reference of Launch Missile Return). I tried fixing this with the SOPSourcePoint launch site as shown below, but it did not appear to work. Does something else need to be done when launching from a non-attachment point?

Here is how I have it setup.

Launch Missile:
(Basic) Effect: Ammo Unit^ Weapon - Boomerang
(Basic) Effect: Impact Effect^ Boomerang Return (Launch Missile)
(Basic) Effect: Periodic Effect^ Search Effect
(Basic) Target: Impact Location^ + (None):Target Point:Unknown
(Basic) Target: Launch Location^ + (None):Caster Unit:Unknown

Launch Missile Return:
(Basic) Effect: Ammo Unit^ Weapon - Boomerang Return
(Basic) Effect: Periodic Effect^ Seach Effect
(Basic) Target: Impact Location^ + (None):Caster Unit:Unknown
(Basic) Target: Launch Location^ + (None):Source Point:Unknown

Return Attack Action Actor(Generic Attack):
(Basic) Art: Boomerang
Combat: Launch Assets + (None):(1.000000):(None)
Combat: Launch Attachment Query + Ignored
Combat: Launch Site SOpSourcePoint
Combat: Launch Site Ops + SOpSourcePoint:Enabled:Enabled
(Basic) Event: Events + (Effect.LaunchMissileReturn.Start; At Caster):(||||||):(Create)

(Token) Launch Effect: Launch Missile Return

I assume the cause is the action actor.

Upon further examination the launch site was falling back to Combat: Launch Site Fallback. Can SOPSourcePoint not be used as a launch site?

Edit: I was able to fix by reverting the two missile actors to generic missiles (yes I forgot to change parent from tentacle missile) and by making the above change. Still it seems there is no launch site now and that fixed it... strange.

Still having a single launch missile effect that returns properly would be preferable.

Awesome! Thanks again DrSuperEvil.