Hi !
I glad you love the game, I not sure about what bug you faces right now but from what I reading, I assume you just finish killing 3 adult slime. after you killing them, you have to go back and speak with Arthur then he will give you several potions, if you already get these potion please return to deep glowing forest and keep exploring in that area and the path to the next location will appear. after you deal 2 fights then you will report back to Arthur again and the Katarina town will appear on the map so you can explore futhur
Thank you for the comment, Hope you enjoy your journey in Willberg 😊