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In my role as a game master, I traditionally shied away from extensive use of luck during my D&D sessions. I preferred was for story direction and what happened in a game to be determined by character actions as opposed to pure luck. That said, I chose to alter my method, and I'm incredibly glad I did.

The Inspiration: Seeing a Custom Mechanic

A popular streamed game features a DM who frequently calls for "luck rolls" from the participants. The process entails picking a type of die and assigning consequences contingent on the result. This is fundamentally no unlike rolling on a pre-generated chart, these are created in the moment when a player's action lacks a clear conclusion.

I chose to experiment with this approach at my own game, primarily because it looked engaging and provided a break from my standard routine. The results were remarkable, prompting me to think deeply about the often-debated tension between preparation and randomization in a D&D campaign.

A Powerful In-Game Example

In a recent session, my players had just emerged from a massive fight. Later, a player inquired after two friendly NPCs—a brother and sister—had survived. Instead of choosing an outcome, I asked for a roll. I instructed the player to roll a d20. The possible results were: on a 1-4, both were killed; a middling roll, a single one would die; a high roll, they survived.

The die came up a 4. This triggered a deeply emotional sequence where the party found the corpses of their companions, still united in death. The group held last rites, which was particularly significant due to earlier character interactions. As a parting gesture, I chose that the NPCs' bodies were strangely transformed, showing a enchanted item. I rolled for, the bead's contained spell was exactly what the group required to address another pressing situation. You simply plan these kinds of perfect moments.

Honing Your Improvisation

This incident led me to ponder if improvisation and spontaneity are truly the core of tabletop RPGs. Even if you are a detail-oriented DM, your skill to pivot can rust. Groups often find joy in ignoring the most detailed narratives. Therefore, a good DM needs to be able to think quickly and create content in real-time.

Utilizing luck rolls is a great way to practice these skills without venturing too far outside your comfort zone. The trick is to deploy them for low-stakes situations that won't drastically alter the overarching story. To illustrate, I wouldn't use it to establish if the king's advisor is a secret enemy. However, I might use it to decide if the party arrive moments before a key action occurs.

Strengthening Shared Narrative

This technique also helps make players feel invested and foster the impression that the adventure is alive, progressing according to their actions in real-time. It combats the feeling that they are merely pawns in a pre-written narrative, thereby strengthening the cooperative aspect of roleplaying.

This approach has long been part of the game's DNA. Original D&D were enamored with charts, which fit a game focused on treasure hunting. Even though current D&D tends to prioritizes story and character, leading many DMs to feel they must prep extensively, that may not be the required method.

Achieving the Healthy Equilibrium

Absolutely no problem with doing your prep. However, equally valid no problem with stepping back and allowing the rolls to determine certain outcomes instead of you. Authority is a significant part of a DM's responsibilities. We use it to manage the world, yet we can be reluctant to cede it, even when doing so can lead to great moments.

My final recommendation is this: Do not fear of letting go of your plan. Experiment with a little improvisation for minor details. It may create that the organic story beat is infinitely more memorable than anything you could have pre-written by yourself.