The Myth at the Table
A Rules Myth is not a lie. It is a memory that drifted. Someone read a rule once, ran it slightly wrong, taught it to a table, and the wrong version calcified into house tradition. Nobody meant to break anything. But when the myth and the book disagree, the book wins, and the moment to settle that is before a character is bleeding out on the dungeon floor, not during. What follows is four rules people love to misremember, and why the correct reading matters.
Start with Torch and Light, because it is the myth that hides in plain sight. The rule is blunt: a torch lasts one hour of real time. Not game time, not a hand-waved “a while.” Real minutes at your real table. Characters without darkvision either carry a burning light source or they are blind, full stop. This is not a flavor rule. Tracking real time is core to how Shadowdark generates pressure, and the hard lesson here is that groups who fudge the clock quietly remove the tension the whole system is built to produce. Rule now, save the argument later.
Weapon Mastery is the arithmetic myth. The base benefit is simple enough: a +1 bonus to attack and damage rolls with one chosen weapon type. The confusion arrives with the Fighter, who adds half their level, rounded down, to attack and damage with their mastered weapon. Players see “level” in the text and reach for the full number. A level 5 Fighter does not add +5. They add +2, because half of five rounded down is two. That gap between +5 and +2 is the difference between a balanced class and a wrecking ball, and misapplying it consistently across a campaign warps every encounter after it.
Turn Undead is the myth of category. People treat it as a spell. It is not. It does not count toward known spells and it does not cost a spell slot, which means a cleric who thinks they are “out of spells” is often sitting on an unused option. The mechanic itself is a roll: it affects undead with a level equal to or less than the result, and those affected flee for 2d4 rounds. Read correctly, its best use is obvious. Point it at a crowd of low-level undead and clear the room, rather than saving it as if it were a precious casting.
Dying and Death is the myth that gets people killed, and it is the reason clarity is not pedantry. At 0 HP a character does not simply die. Each round they make a DC 15 Constitution check or die. A natural 20 on that check stabilizes them at 1 HP. An ally can reach them and stabilize them with a DC 12 Wisdom check. Tables that forget the ally option, or that treat 0 HP as instant death, throw away characters the rules were willing to save. Understanding these checks is the plainest example of the whole principle: the correct rule is more merciful and more coherent than the myth, and the myth costs you a party member.
The thread through all four is the same. Torch and Light governs the pressure. Weapon Mastery governs the math. Turn Undead governs the resource you forgot you had. Dying and Death governs whether that resource matters at all. Each has a popular wrong version, and each wrong version quietly changes the game away from what the book intended.
Running it: Before the next session, read the four short entries aloud at the table for two minutes, agree on each one in front of everyone, and you will never spend a round of dying-and-death argument on rules you could have settled while nobody was in danger.