Blood Herb Quest

Name: Blood Herb Quest.
Location: Green Claw Swamp near Dwarven Bridge
Reward: Blood Herb, which can be exchanged to Witchesbroom.
Monsters: Giant Spider, Slimes, Skeletons, Wasp.

Items needed:

Machete (or Heavy Machete)
Shovel (or Light Shovel)
Rope
Antidote Rune or spell can help.

Description:

Head to the undergrounds, the entrance to which lies on the way from Dwarven Bridge to Venore

Go through the tunnels meeting Rotworms along the way:

Eventually you will come to the surface, next to the coffin, climb the ladder to the top. Now walk along the narrow platform watching out for Witches shooting fire from afar:

Encountering Wasps and clumps of grass along the way, reach the hole. Ditch it and descend:

Walk through the short tunnel until you reach the entrance to the surface, where the Giant Spider awaits:

After killing the monster, go northeast and use the dead tree to get the reward:

And you already have the Blood Herb. You can swap it for the Witchesbroom at Wyda's witch, although you don't have to.