Yeah, when you change biomes it gets noticeably tougher. The hardest change is from Black Forest to Swamp. Are you in top tier armor- have you upgraded your leather armor all the way? That helps a LOT. Also, when you first go into a new biome, you need the best food you can get. For moving into Black Forest, that's probably roast deer meat, roast boar, and red mushrooms. But you want to grab some blueberries in Black Forest so you can make Queen's Jam. Also, upgrade your shield and practice parrying. Either run away from trolls, or kite them using fire arrows. As soon as you can, make a bronze buckler and keep parrying. Ghosts are nasty in the Burial Chambers, but they hate fire arrows. You can run back to the entrance of the chamber and stand on the ramp, and they can't hit you as much. Oh, when you go into a chamber, build a fire right at the entrance so you heal faster and can get the rest bonus right before you leave. Good luck!