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In my role as a DM, I usually shied away from extensive use of randomization during my tabletop roleplaying games. I tended was for story direction and what happened in a game to be guided by deliberate decisions instead of random chance. That said, I opted to change my approach, and I'm incredibly pleased with the outcome.

The Inspiration: Seeing a Custom Mechanic

A popular actual-play show utilizes a DM who often calls for "chance rolls" from the adventurers. The process entails picking a polyhedral and assigning consequences based on the number. While it's essentially no unlike consulting a random table, these are devised in the moment when a player's action lacks a predetermined outcome.

I chose to experiment with this method at my own table, mainly because it seemed interesting and provided a change from my usual habits. The experience were remarkable, prompting me to think deeply about the often-debated balance between preparation and improvisation in a tabletop session.

A Powerful In-Game Example

In a recent session, my party had just emerged from a massive battle. Afterwards, a player inquired after two key NPCs—a sibling duo—had survived. Instead of deciding myself, I handed it over to chance. I instructed the player to roll a d20. I defined the outcomes as: on a 1-4, both would perish; a middling roll, a single one succumbed; on a 10+, they survived.

The die came up a 4. This resulted in a profoundly emotional scene where the party came upon the corpses of their friends, still clasped together in death. The cleric held last rites, which was particularly significant due to previous roleplaying. As a final reward, I improvised that the NPCs' bodies were strangely restored, showing a spell-storing object. I rolled for, the bead's magical effect was exactly what the party needed to address another pressing situation. You simply orchestrate these kinds of serendipitous coincidences.

Honing On-the-Spot Skills

This experience made me wonder if improvisation and spontaneity are truly the core of this game. Even if you are a meticulously planning DM, your ability to adapt can rust. Groups frequently take delight in derailing the most detailed plots. Therefore, a skilled DM must be able to think quickly and fabricate details in real-time.

Employing on-the-spot randomization is a fantastic way to practice these skills without going completely outside your comfort zone. The key is to deploy them for small-scale situations that don't fundamentally change the campaign's main plot. To illustrate, I would avoid using it to decide if the king's advisor is a traitor. But, I might use it to decide if the characters arrive moments before a key action unfolds.

Empowering Player Agency

This technique also helps maintain tension and create the impression that the story is alive, progressing according to their choices in real-time. It reduces the feeling that they are merely actors in a rigidly planned narrative, thereby strengthening the shared foundation of storytelling.

Randomization has always been integral to the core of D&D. Early editions were enamored with charts, which fit a game focused on treasure hunting. Although current D&D frequently focuses on plot-driven play, leading many DMs to feel they need exhaustive notes, this isn't always the only path.

Achieving the Sweet Spot

Absolutely no issue with doing your prep. But, equally valid nothing wrong with relinquishing control and permitting the rolls to guide minor details in place of you. Authority is a major aspect of a DM's responsibilities. We need it to manage the world, yet we often struggle to cede it, even when doing so could be beneficial.

A piece of suggestion is this: Do not fear of temporarily losing the reins. Experiment with a little chance for minor details. It may create that the surprising result is far more rewarding than anything you could have pre-written in advance.