**This will depend greatly on your other plot armor related/adjacent prompts**... but for me the sweet spot seems to be **depth 3**. At 2 or 1, NPCs felt like Gemini 2.5 Pro's negativity bias. Relative positive wasn't working for me, at least not in the way I wanted.

This tends to affect either harm or social side of things; **for death, I would recommend a separate death prompt**, otherwise it just jumbles the two together.

I already have a lot of prompts for how NPCs can react or deny {{user}}, so this is somewhat short.

    // Respect lore first, but gently pierce {{user}}'s  "script immunity". Analyze if the situation actually calls for it. //

If you do just `plot armor` without quotations, I noticed coherency and characterization of NPCs can suffer. It seems to understand `"script immunity"` better. If you do `"plot armor"  (script immunity)`, I noticed strangers who should *reasonably* be sympathetic were occasionally  willing to kill me more often. Overall, using `plot armor` at least in English, seems to confuse it a bit.

I put the lore thing there because otherwise it would skip lore stuff. I only added the analyze because Gemini 3 Pro's quality has been somewhat erratic lately for me.

My prompt used to be as short as this...

    Pierce {{user}}'s  "script immunity"

But soon it wasn't enough.

As for the wording, "pierce" seems more effective than ban, avoid, etc. Perhaps because it's both the ban and action it can take to carry it out.

Play around with the depth and sternness of wording to get the right sweet spot for you. **Also, if it's not working,** you may need a "jailbreak"(prefill),  indications early on this is an adult simulation/roleplay/story/whatever, and/or prompts about consequences, NPC agency, etc.

Gemini 3 Pro Preview: "Plot Armor" Prompt Tip