Give the enemy units a buff with a damage response on Defender when damage is fatal that applies the buff stack to the killing unit. Heroes just have a different one that adds more stacks.
If you want only that hero to have the benefit, just create an aura like ability that applies the buff to the enemies and set the damage response to only work for the damage effect of the weapons on your hero like the massive void ray vulnerability buff.
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Considered easy altering of the unit textures?
http://static.sc2mapster.com/content/attachments/15/252/Screenshot2011-04-17_09_16_21.jpg
For my public assets look here!
http://www.sc2mapster.com/forums/resources/data-assets/46733-the-assets-of-evil/#1
AdamantiumHydra Regular ShmoeSo I'm working on this hero. One of his abilities does the following: On killing a creep (non hero) he gains some health and health regneration for a few seconds. This is supposed to be stackable and stacks refresh the previous stacks duration. On killing a hero, this amount is increased. Honestly, I have no idea where to start with this, and I'm pretty new to the editor. I would greatly appreciate any help.