Comments posted to our Dark Souls 3 Wiki
Im a pure pyromancer and the merchant that sells this spell completely vanished since i never gave him a tome before beating abyss watchers. Am i completely screwed at a certain boss fight in the ringed city on NG+? because im not doing another replay after this one because a stupid DLC that completely screws over pyro builds only to have the best spell for my build completely locked out because of a stupid gameplay design where merchants can vanish due to vague dumb horse*****requirements not being met that no one would ever know unless looking at a guide.


Chosen Undead

Squirming with Insight

Joined: Fri Jan 10, 2014 11:42 am
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Pestilent Mercury isn't actually any good, it's just situationally useful in that one particular fight. You aren't losing anything of value, you can still kill the boss without it, and a chaos-infused weapon should work just fine.
Nigga, the dude made you promise to get him some *****in spells and you just went on your merry way without making an effort to get him the***** he asked for until it was convenient for you, that's not vague or dumb, it's common *****ing decency.
It isn't useless but does require good timing to dish out max damage. In regards to the certain boss fight, I'm on NG+7 and it helped a lot.
Don't play dark souls if you're gonna get mad at little***** like that
Well, though luck m8. It's darksouls. I'm surprised you doesn't progressively lose hp when your menu is open.
You didn't remember your promise did you?

So a guy who told you, "I want you to promise to bring tomes to me," got upset that you didn't?

There was absolutely nothing vague about this questline. Now, pre-patch Sirris eliminating your chance to get a Cat Ring or a second chance at the purple cov. because you respecced at Rosaria? Now that was freaking obscure. Yet even then, she made her contempt for the Fingers quite clear, even tho it was a glitch and only meant to turn her hostile if you actually turned in a Pale Tongue, not respecced.
Does one disappear if another is cast by someone else? Or is it just a visual effect?


First Warden

Joined: Tue Oct 28, 2014 10:12 am
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- It destroys Midir.

-It can be effectively used vs Demon Prince boss and the first two demons (especially in c-op or at low SL)

- it can be effectively used vs the little prince Lothric who is resistant to magic. He is stationary so he takes some serious damage.

Midir dislikes this page
It also dose wonders vs the Dancer. Just hide behind the stairs and let the quick silver cloud do its job!
Note: there can be only one Pestilent Mercury per time, if you cast, then a phantom or invader cast another, yours will disappear because of the new one

Tought this might be interesting to share
I'm not personally aware of what you said. But I can cast several cast in a row, without the others disappearing.
@anon from 4/19: You're either full of***** or confused, i use this spell regularly and as the OP just said it can only create ONE cloud at a time, if you cast the spell before the cloud's time has elapsed it'll disappear and a new cloud with a new timer will appear. I don't personally know whether or not others' pestilent mercury spells cancel out your own cloud, but i don't imagine that to be the case...
Beat midir first try with this
Pestilent Mercury confirmed cheese for the Dancer. :^)
Pestilent is a sorcery that works against every boss. It helps if the boss is bigger or static. Its not a cheese.
High Lord Wolnir doesn't aggro from this spell. Easiest boss fight.
That fight is already the easiest boss fight.
Since spells don't dissipate when you rest at a bonfire, it is possible to kill yourself with this spell while resting.