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When I am a Dungeon Master, I historically avoided heavy use of randomization during my Dungeons & Dragons sessions. My preference was for the plot and what happened in a game to be guided by deliberate decisions as opposed to pure luck. However, I opted to alter my method, and I'm very glad I did.

The Catalyst: Observing a Custom Mechanic

A popular actual-play show showcases a DM who frequently requests "chance rolls" from the participants. The process entails choosing a polyhedral and assigning possible results based on the number. This is essentially no different from rolling on a pre-generated chart, these get invented spontaneously when a player's action lacks a clear conclusion.

I decided to try this method at my own session, primarily because it seemed engaging and provided a departure from my normal practice. The outcome were remarkable, prompting me to think deeply about the ongoing tension between planning and spontaneity in a D&D campaign.

A Powerful Session Moment

At a session, my players had survived a city-wide battle. Afterwards, a cleric character inquired after two friendly NPCs—a pair—had survived. Rather than deciding myself, I asked for a roll. I instructed the player to make a twenty-sided die roll. I defined the outcomes as: a low roll, both died; on a 5-9, only one succumbed; a high roll, they made it.

Fate decreed a 4. This led to a deeply emotional scene where the adventurers discovered the corpses of their friends, still united in their final moments. The group held funeral rites, which was particularly meaningful due to previous story developments. As a parting reward, I improvised that the NPCs' bodies were miraculously restored, containing a magical Prayer Bead. I rolled for, the item's contained spell was precisely what the group needed to solve another critical story problem. It's impossible to script these kinds of serendipitous moments.

Improving On-the-Spot Skills

This experience made me wonder if improvisation and thinking on your feet are in fact the beating heart of tabletop RPGs. Although you are a meticulously planning DM, your skill to pivot may atrophy. Groups frequently excel at ignoring the most detailed plots. Therefore, a effective DM needs to be able to pivot effectively and fabricate scenarios on the fly.

Employing similar mechanics is a great way to train these abilities without venturing too far outside your preparation. The key is to deploy them for low-stakes situations that don't fundamentally change the campaign's main plot. For instance, I would avoid using it to decide if the main villain is a traitor. However, I could use it to determine whether the PCs enter a room moments before a key action takes place.

Enhancing Shared Narrative

Spontaneous randomization also serves to maintain tension and cultivate the feeling that the story is responsive, progressing in reaction to their choices as they play. It prevents the feeling that they are merely pawns in a rigidly planned story, thereby strengthening the shared foundation of the game.

Randomization has long been embedded in the original design. Early editions were filled with random tables, which made sense for a game focused on exploration. While current D&D tends to prioritizes story and character, leading many DMs to feel they must prep extensively, this isn't always the required method.

Striking the Sweet Spot

It is perfectly no problem with thorough preparation. However, equally valid no issue with letting go and allowing the whim of chance to decide some things in place of you. Control is a significant part of a DM's job. We need it to run the game, yet we can be reluctant to cede it, in situations where doing so could be beneficial.

My final advice is this: Have no fear of relinquishing a bit of control. Try a little improvisation for inconsequential details. The result could discover that the organic story beat is infinitely more rewarding than anything you would have planned in advance.