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When I am a Dungeon Master, I historically shied away from extensive use of randomization during my tabletop roleplaying adventures. I tended was for the plot and session development to be guided by deliberate decisions rather than random chance. That said, I decided to alter my method, and I'm very pleased with the outcome.

The Catalyst: Seeing an Improvised Tool

A well-known actual-play show features a DM who regularly asks for "luck rolls" from the players. He does this by picking a polyhedral and defining potential outcomes contingent on the result. It's essentially no different from rolling on a random table, these are devised spontaneously when a character's decision doesn't have a predetermined resolution.

I decided to try this approach at my own game, primarily because it looked novel and provided a departure from my normal practice. The outcome were remarkable, prompting me to reconsider the ongoing tension between pre-determination and randomization in a roleplaying game.

A Powerful In-Game Example

During one session, my group had concluded a large-scale conflict. Afterwards, a player wondered if two friendly NPCs—a pair—had lived. In place of choosing an outcome, I handed it over to chance. I told the player to make a twenty-sided die roll. I defined the outcomes as: a low roll, both died; a middling roll, only one succumbed; a high roll, they both lived.

Fate decreed a 4. This led to a profoundly emotional scene where the party found the corpses of their friends, forever clasped together in death. The group performed funeral rites, which was particularly meaningful due to previous character interactions. In a concluding gesture, I improvised that the remains were strangely restored, revealing a magical Prayer Bead. I rolled for, the item's contained spell was precisely what the group required to address another critical story problem. You simply plan this type of magical story beats.

Sharpening DM Agility

This experience caused me to question if improvisation and making it up are in fact the core of tabletop RPGs. While you are a meticulously planning DM, your skill to pivot can rust. Groups often take delight in derailing the most detailed plots. Therefore, a good DM must be able to pivot effectively and fabricate content in the moment.

Employing on-the-spot randomization is a excellent way to develop these skills without straying too much outside your preparation. The key is to deploy them for low-stakes circumstances that won't drastically alter the session's primary direction. For instance, I would not employ it to decide if the main villain is a traitor. Instead, I might use it to decide whether the characters enter a room just in time to see a major incident takes place.

Empowering Shared Narrative

Spontaneous randomization also serves to maintain tension and foster the impression that the story is alive, shaping based on their decisions immediately. It prevents the perception that they are merely actors in a rigidly planned story, thereby bolstering the collaborative nature of the game.

This philosophy has always been integral to the core of D&D. The game's roots were filled with charts, which suited a game focused on dungeon crawling. While modern D&D frequently emphasizes story and character, leading many DMs to feel they require detailed plans, this isn't always the only path.

Striking the Right Balance

Absolutely no issue with doing your prep. However, equally valid nothing wrong with stepping back and letting the whim of chance to determine certain outcomes in place of you. Direction is a significant factor in a DM's job. We use it to facilitate play, yet we can be reluctant to give some up, even when doing so could be beneficial.

The core advice is this: Do not fear of letting go of your plan. Try a little improvisation for minor outcomes. The result could find that the unexpected outcome is infinitely more memorable than anything you would have scripted by yourself.