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D&D 5E I need some "Watchdog" Monsters

Stalker0

Legend
So for an upcoming game, I need some monsters that are good watchdogs, aka would have a high passive perception score.


The best one I found so far was the barbed devil with an 18, or the wolf also with an 18 (if you assume the keen sense adds +5 to its passive, which I do).


Is there anything better out there?
 

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vincegetorix

Jewel of the North
There's the Mindwitness,
Nothics have true-sight
Dire trolls have a PP of 15 + Keen senses (sight and smell)
Worgs are PP 14 + keen senses (hear and smell)
Gazers and Gaunt arent all that bad either
Hell hounds and hook horror are also good for the job.
 


MarkB

Legend
D&D Beyond has some nice options under advanced filters. A few highlights from searching for tremorsense, truesight and/or trained Perception:

Bulette - Tremorsense 60 feet, passive perception 16
Canoloth (fiend, MToF) - Truesight 120 feet, passive perception 19, cannot be surprised
Gynoshynx - Truesight 120 feet, passive perception 18
Korred - Tremorsense 120 feet
Orthon (fiend, MtoF) - only 30 foot Truesight, but passive perception 20

EDIT: Just noticed this under the Canoloth's description, which would make them ideal for your uses:

"Canoloths prefer to enter into contracts to guard valuable treasures and important locations. They always do exactly as asked — never any more, never any less."
 

Spectators.

Need I say more?

(If you want something else, the others have suggested good options. I particularly like sphinxes, canoloths, intellect devourers, and nothics, as well.)
 



So for an upcoming game, I need some monsters that are good watchdogs, aka would have a high passive perception score.


The best one I found so far was the barbed devil with an 18, or the wolf also with an 18 (if you assume the keen sense adds +5 to its passive, which I do).


Is there anything better out there?

But... you're the DM.

Pick any monster. Give it profiency in perception. Expertise even. It's been specially bred (or recieved the appropriate training).
 

CleverNickName

Limit Break Dancing
I'd probably go with an actual watchdog. I'd take a bog-standard mastiff from the Monster Manual, give it a special ability or the Alert feat (or the Observant feat, or both, similar to what @Flamestrike suggested.) In the description, I'd add a blurb like this:

Watchdog. This hound has received special training from the Captain of the Guard, and is more alert and perceptive. As a result, this watchdog cannot be surprised while she is conscious. She has a Passive Perception of 18, makes Initiative checks at +5, and has Advantage on all Intelligence (Investigation) and Wisdom (Perception) checks that rely on hearing or smell. She is also a very good girl.

And for those who like the simple approach, there's always shriekers.
 
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dave2008

Legend
What level / CR range? Dragons have a high passive perception. A young red dragon (CR 10) has a passive perception of 18 and it goes up from there.

Are you looking for WotC monsters or would 3PP or homebrew work? Here are some of mine with high passive perception:
 

If you are willing to convert a creature to 5E, back in 4e was the Gremlin. There was one that became invisible when an enemy was adjacent to it. I had the as guards once and the rogue snuck up on them. Whoops.
 


Always an option of course, but its nice to know what the raw material is before I start messing with the clay.

I'd just pick a monster, give it proficiency in perception (ore expertise if needed) and then a trait 'cannot be surprised'.

It'll work for pretty much anything.
 

aco175

Legend
Are you trying to prevent the PCs from sneaking past or getting in, or trying to make things hard and challenging? You could have 10 dogs and handlers being led around in 1 minute circles or you can have 1 dog with 2 guards standing over there.
 


Good old fashioned AD&D style Magic Mouths all over the shop, triggering alarms in an ascending shrillness that even Dh’orisz - the minimum waged, half-blind, geriatric kobold that they keep on the payroll out of pity because she’s been there since Rossothrax was a hatchling - even she can shuffle over to the boss’ door and give them the heads up with plenty of time to spare.
 

Eltab

Lord of the Hidden Layer
A galeb duhr (sp?) can just sit and wait forever for something to show up, effectively able to Take 20 on its Perception roll.
The PCs see -whatever it is guarding- and three big ornamental rocks out in front.
 

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