AI no longer acknowledges invisibility.

[Knight Of Pentacles]

Many mobs lock on to invisible people and chase/attack them long after the invisible person has broken line of sight. This is especially troublesome when archers fire on invisible persons from a distance.

Character's Name: Themaz Dtheim
Account: Blackjack and Hookers

Quests where behavior was observed:

Strange Portal, Lower.
DM Quest 4/22/2016, Cowled Wizards appears in Bone Pit to hire adventurers to kill a band of Orogs near The Spire


Mobs seen exhibiting behavior:

Bandit, Archers
Orog Archers
Goblin Troopers
Goblin Bandits
Bandit, Grunts
Kobold Marksmen
Kobold, Thug

[Paha]

As always, and as it has been repeated several times, details matter. If there is to be any hope for us to take a look at things, we need to know more than "AI" or "mobs". We have dozens of different variants and probably couple hundred "mobs".

Think it like this. If you want things to happen, at all, or even fast - give as many details as you can, so that a person who is not there to witness it in person can actually find what to look for.

Details, details, details.

[Knight Of Pentacles]

Updated.

[VanillaPudding]

Also happened with a Warder NPC, an animatron, and Watchmen in a previous dm event.

Hapenns with Leystones, Goblin and Kobold groups.

[Vlaid]

Do not think this behavior is specific to any single or even group of NPCs, but part of some AI tweaks Mort did a while back - unsure of the specifics of which tweaks are causing this behavior.

I could not find a type of NPC that did NOT do this on my last sorcerer. What makes it extra annoying is the random attacks at you by NPCs forces your PC to counter attack, breaking your invisibility nearly every time.

I can't off hand think of any quest or NPC type I did not see this happen on while I was plying my last couple sorcerers.

[sharkinajar]

From my experience I think it only occurs when you go invisible when they can see you. Hasn't triggered otherwise for me before, if you are already invisible and passing them. However if you drink an invis potion or cast it during a battle, can't really get away anymore.

[Stranger]

Leystones have always exhibited this behavior. I believe they have blindsight, or otherwise ignore invisibility as an intended feature. Kobolds are known to drink potions of See Invisibility after "hearing something." Goblin assassins and orog mage hunters also seem intended to ignore invisibility.

[Paha]

Exactly why I ask for details, so we can check, because monsters are not meant to be completely useless or incapable. It's underdark. Many may be able to use tools or have ways to see or find you. On the contrary to belief, invisibility is not one way street to safety.

There are monsters that act differently based on: Whether you were invisible and just passing by. Some will be able to hear you and will react. (More or less in mechanical stand point, you need as much as 25-30 to be able to avoid listening checks totally, even when people very low listen). Under that, there will be a chance that you can be heard and spotted. It works for both PC's and NPC's. Standing still, like NPC's do, just helps them a lot.

Other monsters also act differently if you've already engaged with them. Absolutely, some simply act like that because of nwn mechanics, that they stick to you after having been targeting you, but those will lose you after a moment when you go invisible - unless they are set to come seek you based on other factors (risers tended to have such reaction, intentionally)

Also, if we speak of DM quests, monsters won't act just based on AI. They can act very much like people if DM's have a hand in it, and may often not be comparable to normal AI monsters. It depends completely on the situation DM sets.

[GaiaPraiseBe]

This is something entirely new or otherwise I wouldn't be posting it.  Archers are especially guilty of this behaviour.  This doesn't trigger when you're close to a mob or if you've been seen before.  Archers will simply start firing on you from a distance as though you weren't invisible.  Before the invisible person had to be somewhat close in proximity to a archer mob for them to detect you and fire on you, but now they're detecting at such great distances without the aid of see invisibility or anything else that invisibility is virtually useless.

[GaiaPraiseBe]

Mobs also never "lose" you now.  They will chase an invisible person across the map even if they have broken line of sight in regards to proximity.