Stun — Riftbound Rules

423.1.

Stunning is the act of selecting one or more Units on the Board and rendering them Stunned.

423.1.a.

Stunned is a binary state. A Unit is Stunned or it isn't.

423.1.a.1.

A Stunned Unit can not be Stunned again. Example: Eclipse Herald has the ability "When you stun an enemy unit, ready me and give me +1 [M] this turn." Its controller plays a spell that reads "Stun a unit." They may choose a unit that's already stunned, but if they do, Eclipse Herald will not trigger.

423.1.a.2.

Stunned Units lose the Stunned status at the beginning of the next Ending Step.

423.1.b.

A Stunned Unit does not contribute its might to damage in the combat damage step. See rule 460. The Combat Damage Step for more information.

423.1.c.

A Stunned Unit must still have damage applied to it equal to, or greater than, its full might value to be killed.

423.2.

Stunning is a Limited Action.

423.2.a.

Players may only Stun Units when directed to by Game Effects.

Related FAQ (1)

What happens if units from both sides in combat survive, either because of Kayn or a stun?

In this case, both sides will still assign damage to the other side as normal (stunned units will not deal damage). Units will still die if they are assigned damage equal to or greater than their Might (unless they don't die, for example because of Kayn's ability). Then if units from both sides remain alive at the battlefield, any remaining attacking units will be recalled to base and the defending player will maintain control (no score, though).