Problem with manadrain!

I set

Unit1 (invulnerable building owned by neutral passive) to "targeted as: friend,structure,invulnerable"
Unit2 (invulnerable ground allied unit) to "targeted as: ground,friend,invulnerable"

Then i set Manadrain to

"target: ground,friend,structure,invulnerable"

Should work, right? WRONG

Unit 1 gives the error message: "Neutral units cannot be targeted"
Unit 2 gives the error message: "Unit has to be a enemy"

WHAT - THE - HELL :O

how to make it work?

Well, here are some thoughts.

Firstly, you can make Mana Drain target "neutral" along with the other things you set it to. That should help.

Secondly, Mana Drain is a really specialized skill with lots of behind-the-scenes hardcoding which Blizzard implemented to get it and all its special subfunctions to work properly. This might not be a good skill to customize for this purpose.

A better bet may be to simply trigger the effect you want entirely, and use a generic spell with lightning art to do the lights and shinies you need.

if you set invulnerable and vulnerable it will target everything