Isn't it too difficult? Reaching 18 strength seems impossible. Also event cards are very deadly, one of them deals 12 damage. Is it possible to mitigate that damage?

Also event cards are very deadly, one of them deals 12 damage. Is it possible to mitigate that damage?

You mean Dragon Lord Khorgard? The targeted player fights him, like any Enemy card, if you win (strength >= 12) you take no damage, in case you lose you get the difference as damage (12 - strength) ... so it is possible to take zero damage from this card, or at least reduce the damage taken.

Well, if it would be to easy there wouldn't be any challenge...This said the basic point in a deckbuilding game is to... build your deck,
so destroy your poor units cards and buy powerfull ones and use your units combos.
It is manageable with all races, even if the dwarves are, i think, the most powerfull race in the game for that kind of scenario.