Go to Clock Tower, Heart of the Clock, and complete the main fight against Isaac. Follow-up attacks may still occur after the dive. Approach only once you see the boss itself pause and the afterimages fade.
Watch the wind-up first, then choose your response; the steps below are not a fixed attack sequence.
Detailed steps
Go to Heart of the Clock in Clock Tower and complete the proper battle. The first encounter in Main Hall is not the post-battle reward point for this fight.
Attacks: After teleporting, chooses high or low spear strikes, a spear spin, or a dash attack; afterimages can attack from other directions.
How to dodge: After each teleport, first locate the real body and afterimage, then move out of the straight paths of the spear tip and dash. Don’t repeatedly dodge in the same direction.
When to counter: Attack briefly during recovery after the dash ends; if the afterimage is still attacking, retreat first; don’t assume the whole arena is safe just because the real body pauses.
Attacks: A jump and teleport are followed by a dragon-shaped dive; afterimages may continue pursuing. A longer recovery can only be selected once the dive cycle has occurred three times in total; other branches use short recovery.
How to dodge: When you see the jump begin, first leave the dive path, then locate the real body and afterimage after the teleport. Keep watching for follow-up attacks after every landing; counting the third one does not guarantee safety.
When to counter: Only move in for a brief attack when the real body visibly pauses and the afterimage paths are also clear. Short recovery windows are unsuitable for long combos or drinking potions. Even long recovery may be replaced by a subsequent attack choice; don’t stand still for a fixed number of seconds.
Attacks: A ranged rotating barrage and bat-wing projectiles, possibly followed by a teleport to close in again.
How to dodge: First move between projectile paths, keeping room for your footing. Don’t stand still to drink a potion while the last batch of projectiles is still in flight.
When to counter: Move in for a brief attack after the barrage ends and the path ahead is clear; as soon as a teleport occurs, reassess the facing direction.
Complete the post-battle story and absorb the reward orb to obtain Chronomantic Dive and Chauve-Souris; the same post-battle sequence also makes the weapon chest accessible.
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Chauve-Souris
Chronomantic Dive