Hardest Hollow Knight bosses

Grimm Troupe Master leads with an ELO of 1,500, ahead of Radiance (1,499) and Mantis Lords (1,440). Ranked over 4,975 duels between 28 contenders, last updated October 6, 2026.

Rank the hardest bosses in Hollow Knight. Which enemy gave you the toughest time in this punishing platformer?

How this ranking is computed

Every duel won lifts a contender and every loss drops them, by an amount that depends on the opponent's strength: beating the leader is worth more than beating the last. It is an ELO, the same principle as in chess. Duels are not drawn at random — an adaptive entropy sort puts the least predictable match-ups first, which settles the ranking far faster than a full round robin. A worldwide ranking is only published past 30 completed plays. Known limit: a contender who has faced few opponents keeps an approximate score, and the bottom of the table moves more than the podium.