Why didn't Eiffel find out when he said he would join the sword of flame heraldic seal?

It's not that he can't use it, but that he doesn't go to war (are you afraid of death? In fact, this guy is very brave), upstairs said clearly what the route problem is, so I won't repeat it. In the battle preparation stage, look at the divination options, and chapter 12 can be used! The elf is here to serve you (in fact, it's useless, don't pay attention to his p word) mm-hmm