Written 15 May 2026

Dungeon and Dragons - Knife Theory

Ever heard about knife theory. The Idea is simple, when you write a backstory you give the dungeon master a tool against your character. A good backstory is actually defined by having enough "Knifes" in the backstory for the dungeon master to use.

So if you actually want the dungeon master to use your backstory, you should think about adding "Knifes" to your backstory.

What are those knifes?

Basically everything that can be used against your character. Tho it needs some creativity to make a good one.

The original post of jimbaby lists following definitions:

Of course the would be more, maybe I add my own to the list at some point. It is also important to have some variation in there, don't just have 7 family members trying to hunt you down.

How many knives would be good?

Depends on how important you find that a dungeon master can actually use that "knife" against you. Around 7 are more than enough. That doesn't come from nowhere tho, as the reddit post can be quoted for it.

I always try to incorporate at least 7 knives into my character's backstory, and so far the return has been a stab-ity good time. [...] I've noticed that fewer knives present in my backstory has correlated with fewer direct consequences for my character in game. [...] We like to challenge each other to make surprising and creative knives.

So the likelihood of a knife being used against your character increases by the amount that are actually there, as they open more opportunities. Therefore you should get your own metric if you want to use that knowledge to create your character.

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