NOTE: This source of this bug has reportedly been fixed in the Yukichigai Unofficial Patch. However, I will be keeping this mod up just in case something goes wrong with YUP's fix. My implementation is more of a brute force that should work even if you have already encountered immune creatures.

Additionally, your mod manager may tell you there is an update available. This is simply an administrative change. When I was comfortable taking this mod out of beta, I updated the version number in the description but neglected to change the file's version number. I have now fixed this to eliminate future confusion. The file itself is unchanged, so feel free to ignore the new version unless you want your mod manager to shut up about it.


===========================================

Fallout New Vegas
Explosives Immunity Fix v1.1
By: Sigvaldr/deathblz

===========================================
1. Description
===========================================

This mod fixes creatures that suddenly become immune to explosives damage. Mantises/bighorners/radscorpions/etc. will no longer laugh in the face of grenades, mines, missiles, rockets and mini nukes. It works for both new games and existing saves.


===========================================
2. Installation
===========================================

Extract ExplosivesImmunityFix.esp into your Fallout New Vegas\Data folder and enable it in the launcher/NMM/etc.


===========================================
3. Requirements
===========================================

This mod requires the New Vegas Script Extender (NVSE). You can download it here: http://nvse.silverlock.org.


===========================================
4. Q&A
===========================================

What is this bug?

After playing for a while, some creatures will no longer take splash damage from explosives. Since that's where nearly all of the damage comes from, this renders them mostly immune to the entire weapon category. If your bare fists suddenly do more damage to a mantis nymph than a mini nuke, you probably have this bug.


What causes it?

When the game doesn't want you to interact with an object anymore, it flags it as "Destroyed" (NPCs and creatures have a similar flag called "Ghost"). This doesn't necessarily mean it will look broken in-game. It just won't do anything or show any indication that you can use it. For example, consider the navigation terminal at the end of Come Fly With Me and the radios in Dead Money (if you turn them off instead of shooting them). After you've used them, you don't even get the option to interact anymore. That's the Destroyed flag at work.

For some reason, creatures occasionally get flagged as Destroyed when they respawn. Why does this happen? No clue. I've scoured the default and scripts and found nothing relevant, so I'm thinking it's an engine bug. I also have no idea why it only happens with explosives damage, or why it applies the Destroyed flag instead of Ghost. Not that it should use Ghost either, but it would at least be the proper non-interaction flag for creatures. But I digress.

Tl;dr: Creatures get flagged as non-interactive, which only affects explosives damage for some reason. ¯\_(ツ)_/¯


How does this mod fix it?

Since creatures aren't supposed to be flagged as Destroyed to begin with, it's as simple as checking all creatures in the immediate area for the Destroyed flag and removing it if found.

You could get the same result if you clicked on an immune creature in the console and type SetDestroyed 0. This mod simply automates that.


Will this mod mess anything up?

I am 99.9% sure that it will not. In the unlikely event that the game needs to make a creature non-interactive for some reason, it should be using Ghost anyway. And because this mod only affects creatures, there's no chance of essential NPCs becoming killable for anything like that.

On the off chance that you find something that dies when it shouldn't after installing this mod, leave a comment or send me a message so I can unfix the fix for whatever it is.


===========================================
5. Version History
===========================================

v1.1

• Removed a redundant entry in the .esp
  

v1.0

• Version changed to 1.0 because I am now comfortable taking it out of beta. No actual changes to the file.
  

v0.1 Beta

• Mod released