Combat is organized in a cycle of rounds and turns. A round represents about 6 seconds. During a round, each participant takes a turn.

  • The order of turns is determined at the beginning of an encounter, when everyone rolls initiative.

  • The GM then determines who is surprised. If you are surprised, you can't move or take an action on your first turn and can't take a reaction until that turn ends.

  • Certain things let you take an additional action on your turn called a bonus action (only one per turn). 

  • Certain things allow you to take a special action called a reaction: a response to a trigger of some kind, occurring on your turn or on someone else's.