Invisibility in DotA

Like the one SA has, how the hell did he do that?

I REALLY need stealth like that for my Hero in my mod ;o

Please help if you know, or even just have an idea. I've tried everything, adding invisibility to target, when they gain the aura, ive tried using Shadowmeld but it breaks when moving..

HELP! :]

Take the ability Permanent Invisibility.
If you notice there is a timer on this ability properties, it's the time the unit need to return invisible when he attacks.
It's used by lvl 3 far seer wolves for example.

In Dota there are 3 o 4 levels of it with a lesser timer to become invisible for each level.