I suck please help

Im trying to do the first battle of moonrise but I just can’t. All my characters are level 7 and I’m using tav, karlach, wyll and shadowheart. I went in blind when playing this so they don’t really have good armour or any good stuff like that. I did save the night song and I have the harpers on my side (idk if that’s always the case) but I just can’t defeat them💔💔🫩