Ruins of Elderfen

You drop into Ruins of Elderfen from southern Grimfen (8,2). It's a short area, but think about your first moves: Boneblades and Boneblade Archers hold the ruins (12,5), so don't let them surround you in a narrow passage and deal with the archers before the melee ones.

Egg sacs lie on the floor in the middle section (8,11). Don't walk onto them. Stepping on the eggs bursts all of them at once and each one releases a Wrathspinner. Either go around, or trigger it deliberately when you're at full health with area attacks ready.

There's a hidden button in the east wall (6,9) that opens two secret walls to the west. Behind them is a hidden nook with a campfire and a Heavy Crossbow on the floor (2,10). Worth the detour for the weapon, but you don't need it to move on.

Three chests, none of them close together. The southern one (13,19) holds Embersteel Gloves, a Broken Bone and Ash; the northern one (12,4) a Whispering Ring and two Ironhide Potions; the middle one (14,8) just Ash, Ash and a Rusty Dagger. An alcove in the north has a Skull, a Venom Sac and Solarbloom (6,5).