Death Knights in RPG games are powerful melee fighters who draw upon necromantic and death-related abilities. They wield dark magic, excel in close-quarters combat, and have enhanced durability. Death Knights may control undead minions, spread diseases, and apply debuffs to enemies. They often utilize a rune system for their abilities and possess self-sustaining capabilities. With a dark backstory and connection to undeath, Death Knights offer a unique and formidable playstyle in RPG games.