The question is as follows: If Gnolls attack Zombies in group A, and a hero with an attack of 5 and the "Expert Attacker" skill is present, then with a damage of 2-3 for the Gnoll (let's take the minimum value of 2), the total damage will be 2 + 0.03 + 0.3 = 2.6.
However, if we use another first-level hero with zero attack and no secondary attack skill against these Gnolls, the damage will be guaranteed to be 3.
Conclusion: having a first-level hero with the "Bless" spell, can I cast it on the attacking stack, and will this be as effective or even more effective than increasing attack and the "Expert Attacker" skill?