Parrying god defeats the hardest boss in Sekiro without moving, admits 'I really need a DLC'

A veteran Sekiro player, GroeneWolf420, has done the unthinkable and defeated Isshin: The Sword Saint by using abilities instead of "walking, running, jumping, or mikiri countering," according to a Reddit post. To be clear, this means facing one of FromSoft's most fearsome bosses and somehow parrying through everything, even thrust attacks that are not meant to be parried in the conventional fashion (via GamesRadar). 

You can watch the entire fight, which is just under five minutes in length, and honestly, it looks rough.