What's the best way to kill a circle of druids?

mistletoe?

Crop rotation

Yes, that green leafy plant you buy for christmas that people kiss under.

Mistletoe is in fact a terribly deadly parasite plant that kills trees and spreads.

Its also poisonous.

Its some bad stuff.

Concrete

Plant some sort of cursed seed of a rapidly growing, highly durable plant.

Cursed Lantana maybe, or something innocuous like grass that will just grow in.

Napalm isn't put out by fire

Straight up cant think of any hard counters to a group of high level druids

Any druids with a elemental slant can take care of it

Find a druid.
Put a foot of steel in their chest.
Burn the body.

Do this over and over.

Mid to high level scouts and rogues.

Never heard the term "fight fire with fire"?

Better hope he isnt circle of the moon
The only problem i see with that is high wisdom leading to high perception. Plus things like wildshape or the alarm spell

>The only problem i see with that is high wisdom leading to high perception. Plus things like wildshape or the alarm spell

If rogues were stupid, that could be a problem.

Set a fire, poison a small Creek, set some traps out and let critters die in them. Most druids would investigate and check it out.

As the druid walks up to free the rabid wolf from the trap....that's when the rogue snipes him...as the druid turns to respond to the rogue, the scouts move and shoot.

3 hits (and they should hit), would be about 18d6 on sneakytyme damage alone.
That's round 1.... Round 2: scouts shoot again and finish the hippy off....

Or....potion of greater invisibility and a ring of scent blocking...and go cut their throats as they sleep.

He can commune with nature or speak with animals, but if he doesn't do it that plan would work.
Im thinking a lich might be an option or anything that does psychic damage

A lich would be a nasty enemy for a druid.
What's that undead rogue critter...I like things with backstabbing when taking out high level spellslingers.