The second free content pack for highly-regarded Aussie metroidvania Hollow Knight is now live.

The Grimm Troupe contains a new major quest and boss fights, alongside new Charms, enemies, friends, music, and more.

"Light the Nightmare Lantern and summon the Grimm Troupe to Hallownest, if you dare!" its pitch reads.

"Take part in a twisted ritual that stretches the breadth of the kingdom and bestows the player with a powerful new ally."

In a blog post, developer Team Cherry also announced that Hollow Knight has sold more than 555,000 copies to date across PC, Mac and Linux.

The game is coming to Switch (with The Grimm Troupe included), but Team Cherry is reluctant to give a release date.