Tentacle missiles?

[X-maul]

I want to make a missile (using the drag tentacle model) launch from a unit, hit a target, and then retract back to the caster, and disapear again.

How do I do this? I tried using the spine crawler attack, but couldnt make it work.

 

[Dave312]

Take a look at this tutorial. It is about making an Uberlisk but it also covers how to make Tentacles attack from its back.