@Marty-R Welcome to the forum 🙂
The items you are talking about are not part of the OOB games, so they are introduced with modifications of the games or house rules. Additionally TripleA offers a lot of user created maps where those extras might be included.
You can also check out the Marketplace where special items are offered, sometimes with an idea of how to use them.
I am moving this topic to House Rules for now.