Hearn directed Zara to monitor the Phantom Field that was subconsciously created and Observed by Kokonoe. Curious, Hearn entered the Field himself, taking over as its Observer and finding Zara locked in a fight against Ciel Sulfur, Rei, Raabe, Kokonoe, and Iron Tager. He asked Zara on their progress regarding the data, finding that they were in the process of summoning a Bringer of Demise through a cauldron. Hearn then introduced himself to the three agents of the Mitsurugi Agency, and went to attack Rei before being blocked by Ciel.
Ciel, being a Prime Field Device, caught Hearn's attention as he questioned why she would put her life on the line for a human. He also noticed the BlazBlue Alternative she possessed, calling it flimsy imitation. Kokonoe then launched an attack at Hearn, which Zara blocked. Upon Raabe's demand, Hearn told them that they were Babel, but he turned his attention away from the group as he realized that the Bringer of Demise was about to appear. Tager went to attack him, but Hearn's own Observation prevented the blow from landing. Hearn then left, leaving the rest to Zara.
Hearn returned to Babel's headquarters. Zara soon followed after, letting him know that not only had the Bringer of Demise had been destroyed by the Mitsurugi Agency, but also that the BlazBlue Alternative had been activated to destroy the cauldron and that Another Dark Mai had been retrieved from the Field. Hearn deduced that Rei had managed to stabilize it with their Observation, something which Zara could not believe. Hearn turned down their request to complete the next mission and summoned Semia to his side. He dismissed Zara and told Semia that she was to retrieve Oliver from an experiment site. He told her to expect to encounter the Mitsurugi Agency, but to leave Ciel alive and bring her back, something that Semia was reluctant to do. Once she left, Deuraus appeared, questioning his decision about sending Semia for the mission and about the possibility of extending an invitation to Ciel to join Babel.
- BlazBlue Alternative: Dark War, Chapter 3, 11 - 3
- BlazBlue Alternative: Dark War, Chapter 4, 0