The details are up to you, but you can either determine that the spider is unhearable and unperceivable and as such has 100% perfect stealth, or that it may be perceivable and is potentially vulnerable to a great perception check. But, very few things in this world are completely 100% silent, so RAW there is probably a change (albeit a very small one) that the PCs could detect it with an extremely good active perception roll (assuming they had reason to make one, but thick fog in a cave sounds like a good reason to me). In that case, yes, it would be impossible for your PCs to detect it. So if the spider is 100% silent and has no smell, then you could reasonably assume that a sight check is required to perceive it. Attack rolls against the creature have advantage, and the creature’s attack rolls have disadvantage. This takes us to the 'Blinded' condition:Ī blinded creature can’t see and automatically failsĪny ability check that requires sight. A heavily obscured area doesn’t blind you, but you are effectively blinded when you try to see something obscured by it In a heavily obscured area effectively suffers from theīlinded condition (see appendix A). RAW, here is how you deal with the heavy fog:Ī heavily obscured area-such as darkness, opaqueįog, or dense foliage-blocks vision entirely. So while you are correct that they won't be able to see it, they may well be able to perceive it. While the players may not be able to see into the fog, they can hear the spider clicking around or smell it (I don't know if spiders smell bad or not). Keep in mind that perception is not only visual. If a spider is 20ft away presumably you cannot see it, either passively or by making a perception check, as it's no different to it being behind a concrete wall in terms of sight. The fog was so thick that vision was only 5 ft. In my adventure, I had a spider hiding in the fog. If the DC to notice a hidden creature is a 12, and one of your PCs has a 13 passive perception, they will detect the hidden creature whether or not they're looking for it. Players don't make passive perception checks, their passive perception is always on (it's a passive ability, not an active ability). Spiders are ambush predators, and would use the 5e hiding rules to do this I considered it hiding to mean that it is carefully tiptoeing around the players, staying out of view but watching them so if a player does move within 5ft in technical game terms, it still can't see the spider because although the spider technically occupies the adjacent square, it is hiding somewhere else. Obviously I want the spider to use the fog to its advantage, as it has 10ft of blindsight so can see 5ft further than the players. So can the spider actually hide? If it did hide using its stealth ability, how would you explain that to the players? The players won't be able to swing at where they think the spider is, because the players range is 5ft and they can see 5ft, so there would be no guesswork involved. So how do you handle stealth in this instance? Because if a player moves within 5ft of the spider, it will see it automatically as it won't be behind cover anymore. Or they can make an active perception check to search for them. A goblin hides in a bush, and a player must make a passive perception check to notice them, when they are within the vision of the player.
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