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Message: <blockquote data-quote="smbakeresq" data-source="post: 7486981" data-attributes="member: 28301">Maybe an example will help, like an Invisible Stalker:Invisibility. The stalker is invisible. Unseen Threat. Invisible stalkers are composed of air and are naturally invisible. A creature might hear and feel an invisible stalker in passing, but the elemental remains invisible even when it attacks. A spell that allows someone to see the invisible reveals only the invisible stalker's vague outline. It also has a stealth check of +10.Ok, so the stalker always has the invisible condition.  1.  When motionless, it emits no sound, so it is undetectable barring magic or special sense.  Your  DM might rule it is always making a sound, maybe by air circulation, it is still invisible but now detectable.   In this case I would rule it has a passive stealth check of 20, 10 + its stealth modifier.2.  It can try to move and hide, which in this case "hide" means make no sound.  It has stealth +10 for this.  If it fails you can hear and feel the invisible stalker in passing, like the description says.  If you do not detect it, it still stays hidden from you even though it is moving.3.  If it attacks, the stalker gives away its position but it is still invisible.  You can track it but not see it.  Until it stops making noise (takes the hide action or remains motionless to stop making sound) you still know its location.  Since it is invisible it can always take the hide action to drop off the map.Essentially the Invisible Stalker in most cases will attack with advantage.  If you can detect its location you will still attack with disadvantage, if you cant detect where it is then you have to guess the square.  It can always take the hide action, even in a brightly lit square in the open, to disappear and thus disguise its location.  It can fail this check of course, someone make a perception high enough to notice something, although +10 to stealth is pretty high for its CR of 6.  I don't think an Invisible Stalker makes sound on it own or leaves tracks,  but it does make sound when moving (see description) so if not moving to me it is impossible to see.  When flying around it needs to make a hide check to see if you can detect it, and if it attacks you know its location but it is still invisible.  Some spells will rarely target an Invisible Stalker like Sacred Flame ("a target you can see") as you know where it is but cant see it, or attack with disadvantage (attack roll spells) or be unaffected (area spells like fireball.)  Spells like Faerie Fire are effective if you can beat the Invisible Stalkers saving throw.On an odd note, Barbarians are effective against an Invisible Stalker once the location is known as their reckless attack cancels disadvantage while giving up nothing and an invisible creature attacks with advantage.</blockquote>

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