Sometimes you want to get the jump on a foe or wait for a particular circumstance before you act. To do so, you can take the [[Ready]] action on your turn, which lets you act using your [[Reaction]] before the start of your next turn. First, you decide what perceivable circumstance will trigger your [[Reaction]]. Then, ==you choose the action you will take in response to that trigger, or you choose to move up to your speed in response to it.== Examples include "If the cultist steps on the trapdoor, I’ll pull the lever that opens it," and "If the goblin steps next to me, I move away." When the trigger occurs, you can either take your reaction right after the trigger finishes or ignore the trigger. When you ready a spell, you cast it as normal but hold its energy, which you release with your reaction when the trigger occurs. To be readied, a spell must have: - [[Casting Time|A Casting Time of 1 Action]], - And holding onto the spell’s magic requires [[Concentration]]. If your [[Concentration]] is broken, the spell dissipates without taking effect. For example, if you are concentrating on the [[Web]] spell and ready [[Magic Missile]], your [[Web]] spell ends, and if you take damage before you release [[Magic Missile]] with your [[Reaction]], your [[Concentration]] might be broken.