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I haven’t used aggros recently, so I’m unsure if there has been a change or not, but here is my experience:
The first dose will have the interval effect. After that has taken effect for about 30 seconds (enough time for all mobs around you to have aggro’d you), it SEEMS like those mob spawns are automatically attracted to you going forward (meaning they lose the interval effect and are immediately aggressive as they continue spawning). If you let the aggro effect deplete to 0, all mobs reset and you have to start again (meaning you drink another dose and the interval effect occurs).
My theory is that the aggro effect is attached to the spawn as opposed to the mob. When the mob spawns through an aggro’d spawn, it takes on that aggro effect.
Hope that isn’t confusing, and again, I could be completely wrong (the devs obviously know the details better), but I’m just speaking from my experience.
You're completely wrong, but also somewhat right in what you're saying :D
To explain how it works, imagine a timer that goes off every 3 seconds - when it does, it will try to find one NPC and it will trigger that to aggro the player. That is consistent and nothing ever changes the rate or the behaviour - from start to finish, this remains constant.
However, talking about spawns it differs depending on if an NPC has a spawn anim or not - but let's say it does as the majority of new NPCs do have them. The NPC spawns and on average let's say most spawn anims are 1.8 seconds long. During that spawn phase the aggro potion could target the NPC, spawn anim ends and the NPC will instantly target you. Anim was 1.8s, aggro timer rate is 3s - this means there's a 60% chance that it will appear to instantly target you, and if not it's probably coming in the next second which could also feel almost instantaneous.
Final point as I still see debate going on - I am completely happy to be wrong and investigate further! But I need footage to see if there are any places where it's not behaving as expected. If you do have anything let me know, and we can always look again :)