This ending becomes locked after obtaining the Void Heart. In this ending you take the place of the Hollow Knight, continuing the cycle. Does killing the hollow knight end the game? Weaversong + Grubsong will passively generate soul too, and at a faster rate than Kingsoul. Just use Soul Eater, it’s much much better.
The regen rate is extremely slow (2 soul per second, iirc), and it costs FIVE NOTCHES. He was once the King of Hallownest and mate of the White Lady, until suddenly vanishing alongside his White Palace following the Infection outburst. Type of Villain The Pale King is a posthumous antagonist in Hollow Knight.