It plays during Episode 78, at about 12:06, but also on a lot of other occasions during the series.
Does anyone know what song it is?
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its not a OST soundtrack since in episode 78 like you said, its not in the link below for the 2011 hxh OST list. If it was, it would be in between these times 11:25-12:04 : Nowhere to Escape (O3 - T13) and 12:57-13:38 : The Stalwart's Glaring (O1 - T12)
so what im saying is im not sure how you could find it, but its not an original sound track for sure, so you wont be looking there