Royal Match - King's Nightmare

King's Nightmare, Royal Match Wiki

King Dedede (SSBU) - SmashWiki, the Super Smash Bros. wiki

IELLO: King of New York, 6 Monsters, Enthralling Theme, Simple, Fast-Paced, Strategy Board Game, for 2 to 6 Players, Ages 10 and Up

LEGO DREAMZzz Pegasus Flying Horse 71457 Building Toy Set, Fantasy Action Figure Creature, Comes with 3 Minifigures Including The Nightmare King

12 Video Games Releasing This Fall: Mortal Kombat, Super Mario Bros. and More - The New York Times

Nightmare King Grimm - Art by me! : r/HollowKnight

Court of Nightmares (Courts and Kings)

Hollow Knight - Wikipedia

A horror game based on Nordic folklore.

The Lord of the Rings: The Card Game - Nightmare Deck: Return to Mirkwood Box Shot for Board / Card - GameFAQs