There has been shown that friend chat exists, it's how Rare communicates with her non-human allies. It's possible that party chat itself doesn't exist haven't got this far in the book yet.
Even on the off chance our "Heroes" actually manage to win, it would be a pyrrhic victory, since at the start of the fight Rare sent her undead to capture the town and castle while she played her role.
MC is trained by the 2 strongest in the world to the point no one short of the hero who beat them would be able to beat him, loses to rando so that he can have a bullshit shōnen ass pull power up. These last 2 chapters have really lost me because he didn't get beat because of his personality...