It might help some people to think of Tremorsense in the same way they think of Hearing.
(p.177) "You can’t hide from a creature that can see you, and if you make noise (such as shouting a warning or knocking over a vase), you give away your position. An invisible creature can’t be seen, so it can always try to hide. Signs of its passage might still be noticed, however, and it still has to stay quiet."
When you're trying to detect invisible creatures they aren't automatically hidden, but because they aren't visible they can make a stealth check to hide in plain sight. If that check fails against character's passive perception(hearing) then they would know the location of the creature by footsteps or other sounds. Likewise, a creature could make an active perception(hearing) check to determine their location or even an Investigation check to spot tracks or other tell-tale signs the environment might allow for.
With Tremorsense you can attempt a perception(tremorsense) check to locate the invisible creature (provided they're in contact with solid matter and not incorporeal) or to sense someone trying to sneak up behind you, hide within range or walk by in the shadows, etc. You can't see them but you know where they are and can swing with disadvantage. A DM might rule that you have advantage on the checks since many creatures don't expect or account for it when trying to be stealthy. If the creature isn't even making a stealth check then you would automatically detect them within the range unless DM determines it would still require a perception roll.
With Blindsight you would detect invisible and hidden creatures as though they couldn't satisfy the condition of not been seen. It's up to the DM to determine if this sense would extend through any cover but certainly invisibility, darkness, fog or the blindness condition wouldn't prevent it. The one problem (as always) would still be the "Invisibility" condition's note that they still have advantage and you still have disadvantage on attack rolls against each other. Thats RAW but the majority of DMs out there would overrule it.
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It might help some people to think of Tremorsense in the same way they think of Hearing.
(p.177) "You can’t hide from a creature that can see you, and if you make noise (such as shouting a warning or knocking over a vase), you give away your position. An invisible creature can’t be seen, so it can always try to hide. Signs of its passage might still be noticed, however, and it still has to stay quiet."
When you're trying to detect invisible creatures they aren't automatically hidden, but because they aren't visible they can make a stealth check to hide in plain sight. If that check fails against character's passive perception(hearing) then they would know the location of the creature by footsteps or other sounds. Likewise, a creature could make an active perception(hearing) check to determine their location or even an Investigation check to spot tracks or other tell-tale signs the environment might allow for.
With Tremorsense you can attempt a perception(tremorsense) check to locate the invisible creature (provided they're in contact with solid matter and not incorporeal) or to sense someone trying to sneak up behind you, hide within range or walk by in the shadows, etc. You can't see them but you know where they are and can swing with disadvantage. A DM might rule that you have advantage on the checks since many creatures don't expect or account for it when trying to be stealthy. If the creature isn't even making a stealth check then you would automatically detect them within the range unless DM determines it would still require a perception roll.
With Blindsight you would detect invisible and hidden creatures as though they couldn't satisfy the condition of not been seen. It's up to the DM to determine if this sense would extend through any cover but certainly invisibility, darkness, fog or the blindness condition wouldn't prevent it. The one problem (as always) would still be the "Invisibility" condition's note that they still have advantage and you still have disadvantage on attack rolls against each other. Thats RAW but the majority of DMs out there would overrule it.