Passive ability influencing another ability

Hey,

How would you go about designing abilities, where you have 1 or more spells that, say, do damage on a target unit, and another ability that affects the effectiveness of the damage-dealing-spells.

For example, say I have coil and frost nova on a hero, and his third spell is "increased meditation". (I'm just pulling names out of my ass) The coil and frost nova spells do simple damage. However, the increased meditation is a passive ability, which increases the damage of coil and frost nova, as well as reducing their cooldowns and their manacost.

How would you go about in doing all that?

Thanks!

Tinker's engineering does this, but it requires alot of extra abilties. Still, thats the only way I know of.

Wut LegolasArcher said, U need to use the engineering upgrade ability that the goblin tinker has.