Special Effect: Drain

You know about the drain life or Mana spells.
By using the special effect Trigger you can place them on the map , but how to put that drain spell ????????
I want to create a spider net made of magic

Err please be clearer about what you want to do. Do you want to make a spell using the drain life effect or do you want to create a doodad kinda thing?

I THINK you're asking about how to make it as a map feature, like a doodad so i'll answer there. I would create a few invisible units, edit the drain life spell to have 0 effect and change it's buff so the graphic effect lasts forever then at the start of the map make these invisible units attack one another.

Thats what i want !
You start as Peasent and you can chang eto a Priest or Footman , and to mark that you can change to the footman or priest , I want to place those Drain spells , they will create a big net ! connecting units , it schould only show from whitch unit you can morph into what other unit

You mean spider web not net? Net is sounds like a polish word for web or?

Obviously, you've never heard of a net... Like in, a fishing net? I am guessing he was talking about web, but it is a net. And hey, web and net are both synonyms for internet :P.

Regards
Dead-Inside

Net is a english word !
I meant web , but I forgot that there is something like a web. Whatever i mean .
I attached a image explaining how it suspose to look
The Red point is the first unit you control , the arrows around it show to what unis you can change . from those green units you can morph into blue units and so on and those arrows that show into what units you can change are suppose to be those drain spells

It's pretty simple. Just create a number of invisible units with 5 life, 5 mana, and and make two custom abilities based on mana and life drain. Set their duration to 65 seconds and their drain amount to zero. Make a periotic event that tells these units to drain another every minute or 60 seconds.