I Need have a spell based on Dark Ritual.. Can someone help ?

[Nonirik]

Ok it's my first time posting something in here, so be nice with me =)

Guy's i'm doing a hero for my map, and i think on a spell based on dark ritual form Lich..

I have two problems, a spell based on dark ritual must be targeting an undead, and the other is dark ritual only heal mana from the user.

I need to target anything and based on target life ( leave the creep/hero/target alive ) I want to give LIFE to all nearby friends in 400 AoE

Ex: I'm with my hero and want heal I have 50%(500 of 1000 hitpoints) of my life, the skill give 100% of current life.
So if I use the skill on myself it will heal nearby friends for 500 hitpoints too.

Is it possible ?

Thx in advice..

Diego Rodrigues.