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Killing the Vampiric Serpent was easier than he initially thought and it was mostly thanks to the unique circumstances that it was in.
Destroying the heart on the other hand, was a different matter...
With the Vampiric Serpent's death, it's body dissipated into dusts, much like what happens whenever Vendrick kills other demonic beasts using his lighting. To his surprise however, he saw that the heart was unscathed even with all of that.
It was a strange sight if he was being honest. The heart, which still occasionally pulses from time to time, looked like it's made out of flesh but not even a scar could be seen on its surface. Vendrick knew that the Tribulation Lightning definitely struck the heart, he saw it happen with his eyes. So seeing it unscathed after an attack of that caliber when the Vampiric Serpent easily died due to it, was surprising.