cr:7.7.2c

If, before damage is calculated during the Damage Step,[7.5.2] the active-attack ceases to exist and there are no more attacks in the queue, the Close Step begins as a game state action.[1.10.2]

Example: Luminaris has the text ”. . . Illusionist auras you control are weapons with 1{p} and “Once per Turn Action – 0: Attack”.” If a Spectral Shield token is activated to attack the opponent, and the token is destroyed before the Damage Step, the activated attack will also cease to exist, and the Close Step will begin.