While his father sent him on an intel-gathering mission to Carne ostensibly to protect his heir, First Prince Barbro is determined to earn the throne through distinguishing deeds, not simply sit back and inherent it (also, he must suspect either the nobles or his siblings will ultimately plot against his succession once daddy’s dead).
This would be all well and good if Prince Barbro were good at anything. But reader: He is not. Scratch that: he’s good at making increasingly bad decisions and only quitting when it’s too late to save either his army or his own hide. And it didn’t have to be this way; had he negotiated peacefully with Carne rather than try to kill her, she wouldn’t have blown the little horn Lord Ains gifted to Enri.
When Barbro’s troops reform after initially getting their clocks cleaned by Carne’s trained ogres, he forces Enri’s hand, and with no other options and Barbro’s horsemen nipping at the heels of the escaping children, Enri blows the horn, not quite knowing what it will do.
Well, the Horn of the Goblin General does no less than summon a massive, 5,000 strong goblin army, extremely well-equipped, well-trained, and unquestionably loyal to the person who blew the horn. We’re presented to wave after wave of (somewhat shoddy) CGI columns of all the various units kitted out in splendid battle attire.
Even Momonga/Ains is caught off guard by this sudden development; he had assumed the horn would summon twenty decent goblins at best, but nothing like this. He deduces internally that the size and strength of the army must be determined by the individual blowing the horn; in this case Enri. She already had the loyalty and love of her village and its goblin garrison; the horn thus conjured a suitably badass force.
Needless to say, Barbro’s forces are routed and thrown into retreat, though as I mentioned, the order to flee is given too late. Later that night we learn the truth of the matter: Beta “added her voice” to Enri’s horn blow, resulting in the overpowered goblin army (even she was surprised by how big it was).
She also nonchalantly (as befits one of the Seven Stars) breaks the bad news to Barbro that his existence isn’t part of Lord Ains’ plans, and so he and his entire force will be massacred forthwith.
So it’s R.I.P. Barbro–it’s probably better for the kingdom that he never ascended the throne–and all hail the Glorious Goblin General and victorious Chief of Carne Village, Enri Emmot. May she and Nphirea someday get to roll around in the hay without interruption from incompetent princes.