There is a thing called "5e: HARDCORE MODE" which is basically a set of house rules for the D&D 5th edition. I want to ask a couple of questions about this thing, but I hesitate how to tag these questions. There is no specific [5e-hardcore-mode] tag, and just [dnd-5e] is just wrong, because the question is not about 5e rules, it is about these particular house rules.
Which tag is more preferable? Should I create a new one?
The important bit is to keep the information in the body.
Then, if you are asking a question about a topic which we don't have a tag for, sure make one. A specific ruleset counts as such a topic as far as I see.
The tag would then collect questions about that ruleset usefully. Having a tag that collects a narrow topic isn't a cost, and if it's too narrow it'll just get roomba'd (if it doesn't have a description).
As for having a tag for a specific ruleset modification, it's not something that comes up often, but for prior art see the e6 tag.
