Honestly, this is almost nothing. Perhaps the simplest mod you could do, but I'm putting it up for others convenience if they're annoyed at Wormhole Sentinels killing chunks of fleets, while being nigh unkillable.
EDIT: Thanks to Ovalcircle1 for actually testing it and finding where I tripped. It needed the line "built_by="BasicSentinelDrawBag"", even though this is only a modification. This actually prematurely fixed an issue in the next one.
Instructions:
Download the zip, and extract it. Go in it, and copy the folder there (it weirdly put it in another folder, sorry, don't know why), into the XMLMods folder in your AI War 2 directory.
Once it's in there, go to PlayerData, in the same directory, and open XMLLoadingOrder.
Under _Vanilla, put "PuffinNerfGunSentinel" (remove the quotes).
You should be able to load the game and have the Wormhole Sentinels do a measly 2 damage. They seem to now have two of these, but that's alright, it's just a ramshackle thing.
Hope it works...this is simple, but never done anything like it before.
(For devs, had some oddities while doing this. Every time I try to mod a unit using this method, I always have to give it the explosion sounds, else the game pops an error at me. Also, if I try to partial_record the system, it complains about unrequested XML attributes, so I have to put the entire system in there, which might be why it now has two guns?)
Should note that you'd want to take these out once the new update hits, as this'd override that. Just remove the line from XMLLoadingOrder, and the folder from XMLMods.