Reactions
Certain abilities are designed to be reactive, allowing a Hunter to respond quickly to unfolding events during combat. These abilities are known as "Reactions".
Unlike Prepared Actions, Reactions don't require a Hunter to spend their main action in advance. They can happen on another creature's turn or on the Hunter's own turn, as long as the trigger in the ability's description occurs and the Hunter can pay its costs.
A Hunter might leech a bit of lifeforce during an enemy's attack, or create a split-second barrier to protect a wounded ally.
Reaction Limits
A creature can use only one reaction to a particular triggering event, even if several of its abilities could answer it. Hunters do not have a general one-reaction-per-round limit; they still need the required charges and a valid trigger each time. Horrors also obey their assigned number of reactions per round.
An ability cannot keep triggering itself, directly or through the consequences of its own reaction, unless it explicitly allows that sequence. Specific restrictions on acting or reacting still apply. A Downed Hunter cannot react simply because they have a charge left.
When Reactions Happen
A reaction that changes an attack roll or its Hit Threshold must be declared before that roll. Resolve other reactions after their triggering event unless their description explicitly interrupts or prevents it. For example, redirecting an attack changes its target before the attack roll, while Correction has its own window after the outcome is known but before its effects reach the Hunter.
If several creatures react or release prepared responses in the same window, resolve them in Pace order. Check that each response still has a valid trigger and target when its turn to resolve arrives. Outside combat, the Overseer establishes the order before resolving the responses.
Overseer: "The spectral hound lunges, its fangs dripping with otherworldly venom. What do you do, John?"
John: "This thing is getting too close for comfort. Time to play my ace in the hole. I use my 'Correction' reaction!"
Overseer: "The hound's attack would hit, but before we apply its damage, you skip backwards in time. Its jaws close on empty air. Spend your Correction charge; the hound has still used its attack."
Amy: "I think you just broke the laws of reality, John. Impressive!"