For questions about evaluating the viability of new rules content homebrewed for an existing system. This tag should be used when locally-created, non-published content is at the heart of the question. (Note that soliciting ideas for creating homebrew is off-topic for the site.) Not to be confused with the [house-rules] tag. For creating entirely new games, use [game-design]. For questions about homebrew in general, use the [homebrew] tag.
For D&D 5e see also (may also have applicability and usefulness to other systems):