Secret Knowledge - Attacking, Defending, Fortresses 1?
At lvl 32, I want to start Secret Knowledge upgrades. My Hero has Siege Special armour. My 2 key Shamans are Einar the Free, and Rainar the Wanderer, both with relevant Shaman armour. Which of the 3 categories Attacking, Defending and Fortresses1, is the best for SH Sieges? How and what are the best usage/s for the 3 categories?