I noticed some summons like the Djinn and Mistform have invisibility. Is this supposed to be something good? The only effect I see is that your summon will be ignored on the defense so you can't use it to guard any of your units. I'm not even sure it would be helpful with the Summoner trait because wouldn't you prefer your temporary units get attacked rather than the ones that won't be disappearing in a few turns anyway? If it's just for flavor I guess that's a good thing, but it makes those summons only half as useful as others. It makes sense on the Mistform as hidden nationality is very abusable, but for the poor Djinn it seems to gimp him.