How to make skill that will suck health and give them to caster (aka vampire)

RPG maker XP

If I want it to be attacking skill (target: opponent) I can't get monster heal itself, and if it is casted on caster (target: caster) then I can't drain health from victim (player in my case). Any ideas? I tried to make use of status effects but manage nothing with it.

So what I want is that my monster, vampire for example, in one attack hurt opponent and heal itself (if it is possible in same amount as he hurt player).

use common events and make a skill called 'suck', 'absorb', etc.  Its kinda hard for me to explain

I guess that one script I posted some time ago is gone. =/ I'll see if I can dig it up. Should be collecting cyberdust somewhere on my hard disk.