Gold Knight

The Gold Knight is a main boss and NPC in Hollow Knight: Lost Souls. He is first found in The Ruins alongside Hornet. Once you enter the screen with them inside, Hornet uses her silk and grapples away, leaving Gold Knight to deal with the threat. Defeating Gold Knight will unlock dialogue with him. He will allow access to the rest of the temple, unlocking the Gold Slash spell. He will remain as a merchant in this spot for the rest of the game, allowing him to be hired as a mercenary to help you the next time you fight a boss. Note that he will NOT appear during Gold Knight and Shade Keeper bosses.

After the defeat of the Unified Traitor Lord, he will move to The Hive in which he can be seen talking to a Hive Knight. Approaching him will cause the Hive Knight to run away, and speaking with him will grant you the Hiveblood charm. He will return to the Temple after this encounter.

Lore
After his defeat in the Temple of the Black Egg, he is summoned to Godhome to take part in the Godseeker's ritual and battles the Knight once more. After the defeat of the Absolute Radiance, he awakens in the Temple of the Black Egg, running into Hornet. After a quick battle, the two quickly become friends. Not long after, he gives himself new armor, a new name, and a gender. He explores the uninfected kingdom, visiting places to catch up on what he missed.