tldr: I think you should not be able to merge heroes, only armies.
I’m planning another change that sounds small but might mess with the game a little and I thought I would post here for your feedback first.
A few months ago, when I was improving ranged attacks to make the consistent with melee attacks, and working on the merging of units, I think I made a mistake by allowing all kinds of cards to merge.
I really liked the idea that there was really no differences between an elf with a bow and a wizard with a staff. If you have 20 elves, the strength of their ranged attack should just multiply by 20, and so likewise, if you group 20 wizards together, their attack should be 20 times more powerful.
While a I really like the consistency, of this approach, I believe it has led to complication and confusion in a number of other parts of the game.
(I briefly mentioned this issues in a thread a few weeks ago, and that’s when I starting thinking we might want to roll it back a little)
So I propose we distinguish Army Cards from Hero Cards.
Army Cards are rank and file troops. When they have powers, the powers always scale with the number of people in the group. Elf and Goblin Archers, Orc Chariots, that kind of thing. You will be able to merge these as you do now.
Hero Cards will be heroic individuals. You will not be able to merge them together (And therefore their powers won’t ever need to scale). This means we’ll be able to simplify the description of each power, and you won’t need to worry about if it makes sense to merge a hero or not.