Reincarnation?

Hello, I was wondering if any of you know a decent way of making a triggered reincarn,

The map uses 2 universal death triggers (1 for each team) and this trigger must not fire unless the hero is truely dead (does not rein)

Problem is the spell must:
1) show cooldown
2) NOT revive the hero with full hp +mana!
3) should be 3 levels
4) should revive him with 10x(level of ability REIN for dying unit)% of max hp & zero mana.

any thoughts on this guys as im stumped.

I'm not too good at reading jass..

Or to sure about this "handles" buisness, is there any more indepth guides or explanations that might help me understand this?

Hmm I didn't get what you mean by show cooldowns I mean a timer or a heros skill? As for 2nd you can edit in triggers by set life % and mana %. As for 3rd you need a trigger for each level I think. And the last one needs integer and variable stuff it should be like 10*(variable)hpofhero1(red) set life action probably.