Building block rules for Twenty-sided Worlds
Rules of Your Turn
- You can attempt one action and make one move on your turn.
- You can sacrifice your move to gain advantage on your action.
- You can sacrifice your action to move twice.
- You cannot perform more than one magic action on your turn. Inviolable.
- You cannot act outside of your turn unless an Item or Feature grants you the ability to use a reaction.
- You cannot use a reaction more than once between two of your turns. Inviolable.
- You cannot use a reaction during your turn. Inviolable.
- One hit deals one die of impact to one target on your turn.
- One critical hit deals one extra die of impact to one target on your turn.
- You may sacrifice all extra dice of impact to instead use a special critical effect
- You cannot benefit from a critical hit when it isn’t your turn.
- You cannot spend a spotlight when it isn’t your turn.
Rules of Risk and Prudence
- You can achieve greater impact by using the right tools, the right plan, or the right training, because prudent preparation is rewarded with greater effect.
- You can achieve greater impact by attempting actions that risk more severe consequences because this is an adventure game played for entertainment, and risky actions can be entertaining.
- You can increase impact by accepting greater consequences for failure.
- You can minimize the chance of failure at the cost of reduced impact.
Rules of Cost
- You cannot sacrifice what you don’t have, nor can you sacrifice what you have already spent.
- If a rule asks you to choose between sacrifice or X, you must choose to sacrifice before doing X, whatever X might be.
- If you cannot complete the full sacrifice, you cannot make the sacrifice
Rules of Limits
- AC/DC 23 is the highest AC/DC a player-controlled character can set
- Companions are player-controlled
- NPCs/Monsters are not player-controlled, and not subject to this limit
- The highest level attainable by a PC in any of the three categories is 10
- Individual Features and Items can be improved no more than 3 times.