+20% health to all stacks?

[Metathron]

The troops of one of Haas' incarnations have 20% more health, which is huge considering they're all level 4-5 creatures.

Is there such an artifact in the game? I don't think there is. This makes me think this is a scripted effect, especially because this dragon is "the embodiment of strength." Never noticed this before. Yikes!

[Razorflame]

never noticed it
but then again
he isn't a problem anymore at that stage of level :)
^^

[BB Shockwave]

You know, that is one thing I was missing from AP - in the Legend, you could encounter enemy heroes who gave some bonuses to certain troops, for example making Giants faster, etc. It was an interesting and challenging diversity.