Creating a VampireSpell: Bite!

I thought alot how to create a "real" Vampire spell, bite a unit to gain life...

It should:
Disable the unit if possible (sleep?)
Slowly gain life (canabalize/reju)
Should maybe do some damage...

Can anybody think of a trigger/spell combination to do this?
Deathpact for example would be good for this, but it kills the enemy unit instant, instead of slowly...

hm,
unit is issued order

order issues = deathpact


order unit to stop
disable user control
pause targeted unit
order use to move to position of targeted unit (i think that those 2 can be done)
play a units animation
wait
use order unit to use deathpact

that could be 1 idea of it. if it a single player map, throw in a few waits and have it do some % damage every few seconds and add a % to biting unit

deathpact would be instakill, so no way >_<
and multiplayer.. hm.. maybe a 2 sec timer?

If you want a % hit, use bash and add the life gain effect through a trigger.

or...

If you want a one-shot that costs mana...Stormbolt (decrease range) and add the life gain effect through a trigger.

or...

My preference would be to use slow poison. You'll get a slow effect instead of a stun (which is probally better) and a dam/second effect. Then just create a trigger event for each ATTACK with the condition that the attacking unit have the Vampire Bite and an action that adds the a damage % of the attack to your that unit's life.

if u were to use the "order issued" event, it would not have the same effect u would desire. If u just have the order issued, than the actual spell would not have to happen. So u could stun the enemy and drain his life just by ordering the spell and then cancelling it.