A lot in campaigns can be handwaved. normally, in TDE a fight 1:1 against orcs would take some... 5 rounds to dispatch. In my Year of the Gryphon campaign, I barely ever used full on fights: I bunched a group of orcs into units, and hits above a certain number removed an orc as a wounded or dead. Since we were fighting an army basically, it made sense.
Then, the end boss. They **knew** they could not kill the monster endboss, but they did their best so one of them could actually blow the horn to summon the gryphon that would dispatch the demon.