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In my role as a DM, I usually avoided heavy use of chance during my D&D sessions. I tended was for narrative flow and session development to be determined by player choice as opposed to random chance. However, I opted to alter my method, and I'm truly glad I did.

The Catalyst: Seeing a Custom Mechanic

An influential streamed game features a DM who frequently requests "chance rolls" from the participants. He does this by selecting a type of die and defining possible results based on the result. While it's fundamentally no unlike consulting a pre-generated chart, these are devised on the spot when a course of events has no clear outcome.

I decided to try this method at my own table, mostly because it seemed interesting and offered a departure from my usual habits. The results were eye-opening, prompting me to think deeply about the ongoing dynamic between pre-determination and randomization in a tabletop session.

An Emotional Session Moment

In a recent session, my group had concluded a city-wide fight. When the dust settled, a cleric character asked about two key NPCs—a pair—had lived. Instead of deciding myself, I asked for a roll. I instructed the player to roll a d20. The stakes were: a low roll, both died; on a 5-9, only one succumbed; a high roll, they both lived.

The player rolled a 4. This resulted in a deeply emotional sequence where the adventurers discovered the bodies of their allies, forever holding hands in their final moments. The group conducted funeral rites, which was especially significant due to earlier character interactions. As a final gesture, I decided that the forms were miraculously restored, showing a magical Prayer Bead. I randomized, the item's magical effect was precisely what the group needed to solve another pressing story problem. One just script this type of perfect story beats.

Improving DM Agility

This incident made me wonder if randomization and spontaneity are in fact the beating heart of tabletop RPGs. Even if you are a meticulously planning DM, your ability to adapt need exercise. Players reliably find joy in ignoring the most carefully laid plots. Therefore, a good DM has to be able to think quickly and invent content on the fly.

Employing luck rolls is a great way to train these abilities without going completely outside your preparation. The key is to apply them for small-scale decisions 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 would consider using it to decide if the PCs reach a location right after a critical event occurs.

Enhancing Collaborative Storytelling

This technique also serves to maintain tension and foster the sensation that the game world is dynamic, shaping in reaction to their choices as they play. It combats the sense that they are merely pawns in a pre-written story, thereby bolstering the collaborative aspect of the game.

This philosophy has historically been integral to the game's DNA. The game's roots were reliant on charts, which fit a playstyle focused on treasure hunting. Even though contemporary D&D often prioritizes narrative and role-play, leading many DMs to feel they need exhaustive notes, that may not be the required method.

Finding the Healthy Equilibrium

There is absolutely no issue with doing your prep. But, equally valid nothing wrong with letting go and letting the whim of chance to guide minor details instead of you. Direction is a big part of a DM's responsibilities. We need it to manage the world, yet we can be reluctant to cede it, at times when doing so can lead to great moments.

My final suggestion is this: Have no fear of relinquishing a bit of the reins. Embrace a little randomness for inconsequential story elements. The result could create that the surprising result is far more memorable than anything you would have pre-written in advance.