(If you don't like sickles and other inaccurate weapons, transmute them).
Lure an enemy to a location near the trap, then throw something into the trap. Make sure the trap is closer to the enemy than to you.
What a great suggestion!
And I think the Sad Ghost should also have a reaction when seeing the Dried Rose.
It's the Wooden Decoy that can be created with the Body Replacement talent of the Smoke Bomb armor ability (the ability you get after defeating the fourth boss).
I filled the vents (in the Toxic Gas rooms) with water, and it really worked.
That means Aqua Brews have another use: get free Potions of Purity! I usually save Potions of Purity to deal with the Rotting Fist + another fist combo (especially ones with ranged attack ability). When you enable the Badder Bosses challenge, two fists will appear at the same time).
(I only have the screenshot of the result. Sorry).
(I enabled Barren Land).
No, it won't.