Lauri

I'm not quite sure if it's like you want, but you could try having a look at the Rohan belltower thing in Age of the Ring, I believe that has something similar?

Hi

You'll have to "write" a new asset.dat for the new art to be recognized in-game if they show up pink. Otherwise it might be an issue with your coding not being read by the game.

Hi

I'm not sure which of these two questions you ask, but I'll give you two answers.

Editing imported scripts:

Simply click on the folder og script you want to edit, then press on the Copy button. It'll copy the script and override it locally in the map/library you're in automatically.

Importing scripts:

On the menu to the left you should have buttons for Export Script(s)... and Import Scripts..., among others.

The question is: is it possible to somehow destory (or maybe just hide) the attached TheDroppedRing entity?

You should be able to kill it by having the hero(es) triggering a weapon that only targets TheDroppedRing upon recieving the Upgrade_MyFancyUpgrade upgrade, and kills it instantly. You might have to adjust TheDroppedRing's health, I believe there's an InstantlyKilledBy mechanic (though I might misremember the name). You can then decide if the hero will drop a new ring upon death when it has that upgrade, which could again remove Upgrade_MyFancyUpgrade from the hero.

At least I don't see an issue with this.