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As a Dungeon Master, I historically shied away from extensive use of chance during my D&D games. I tended was for narrative flow and session development to be determined by player choice as opposed to random chance. Recently, I chose to change my approach, and I'm incredibly happy with the result.

The Spark: Watching a Custom Mechanic

A well-known actual-play show showcases a DM who often asks for "chance rolls" from the players. This involves picking a specific dice and assigning possible results contingent on the number. It's fundamentally no different from using a pre-generated chart, these get invented in the moment when a character's decision doesn't have a predetermined conclusion.

I chose to experiment with this technique at my own table, mainly because it looked interesting and offered a departure from my normal practice. The outcome were fantastic, prompting me to think deeply about the ongoing dynamic between preparation and improvisation in a D&D campaign.

A Powerful Session Moment

In a recent session, my group had concluded a city-wide conflict. When the dust settled, a player asked about two friendly NPCs—a sibling duo—had lived. Instead of choosing an outcome, I let the dice decide. I instructed the player to roll a d20. The possible results were: a low roll, both were killed; a middling roll, only one succumbed; a high roll, they made it.

The die came up a 4. This triggered a profoundly emotional sequence where the adventurers came upon the bodies of their allies, forever united in their final moments. The group conducted a ceremony, which was uniquely powerful due to earlier roleplaying. As a final gesture, I improvised that the NPCs' bodies were strangely restored, showing a enchanted item. By chance, the bead's magical effect was precisely what the party lacked to resolve another major quest obstacle. It's impossible to orchestrate such magical moments.

Honing Your Improvisation

This incident caused me to question if improvisation and spontaneity are in fact the core of D&D. Although you are a prep-heavy DM, your improvisation muscles can rust. Players often take delight in derailing the most carefully laid plans. Therefore, a skilled DM must be able to adapt swiftly and invent content on the fly.

Using luck rolls is a great way to practice these talents without straying too much outside your usual style. The trick is to apply them for minor decisions that won't drastically alter the overarching story. To illustrate, I would avoid using it to establish if the central plot figure is a traitor. Instead, I would consider using it to figure out if the PCs reach a location just in time to see a key action unfolds.

Empowering Shared Narrative

Spontaneous randomization also helps make players feel invested and foster the sensation that the game world is dynamic, progressing based on their choices immediately. It combats the perception that they are merely characters in a rigidly planned script, thereby bolstering the shared foundation of roleplaying.

This philosophy has historically been integral to the original design. Original D&D were reliant on encounter generators, which made sense for a game focused on dungeon crawling. Even though contemporary D&D tends to prioritizes story and character, leading many DMs to feel they must prep extensively, that may not be the only path.

Achieving the Healthy Equilibrium

There is absolutely nothing wrong with being prepared. But, there is also nothing wrong with letting go and letting the dice to decide some things rather than you. Direction is a big factor in a DM's role. We need it to facilitate play, yet we often struggle to release it, at times when doing so might improve the game.

The core suggestion is this: Have no fear of relinquishing a bit of your plan. Experiment with a little chance for minor details. It may discover that the surprising result is far more rewarding than anything you could have pre-written in advance.