Argggh.... press the wrong button

Hello!

I was just pondering the hydra´s and the troll´s lifepoints. Do they gain lifepoints in battlebacks, when they roll lore??? Or only on attacks?? Same goes for other creatures....?? for example the giant, does it use pushback when battlinback?? What about the lorecard that kills entire unit if any lore are rolled, does it include creatures as well?? And final what about the cleric healing lorecards, can i use them to restore creatures(hydra&troll) lifepoints???

Played the hydra&troll few times, always kept them in back, cause they are easily killed than other creatures(my opinion) Hill and wood giant rules! :OD

Thanks!