Lords of the Fallen is an action RPG set in a fantasy universe where no sins are forgotten and the rulers aim to banish all sin from humankind. The protagonist, Harkyn, a criminal, carries his sins as runes on his face. He is convicted for crimes not revealed to the player. The human realm is attacked by an army of gods, and Harkyn is released to fight them, as a chance for redemption. The linear story is divided into different acts that guide Harkyn and his mentor through the Rhogar dimensions inhabited by demons.
The game's combat style can be chosen from three magic types: brawling, deception, and solace, with four specific spells each. There are also three equipment selections available: cleric, rogue, and warrior. By defeating enemies, experience is gained to unlock new skills and spells to use in combat. The gameplay focuses on strategical use of attack, defense, dodging, and spells, similar to the Dark Souls series.
During combat, it's possible to lock onto opponents. Timing is important to use the shield to block incoming attacks, followed up by a chain attack, or using evasion through ground rolls with temporary invincibility. Combos can be performed by mixing light and heavy attacks with certain risks for attempting chaining. Charge attacks provide more damage during combat. The player must manage their energy bar, which drains after each action.
There are three bars at the bottom that can be leveled up: health (red), energy (orange), and magic (blue). Each action drains the energy bar for a certain amount. Skills can be upgraded for overall statistics or for any of the three magic types based on spell points and attribute points with separate experience systems.
The game has many additional features, including multiple paths with hidden locations, quests, NPCs, and a large amount of lore. Saving can only be done at specific glowing gem checkpoint locations, which also replenish consumable items like potions. The PC release does not have a regular edition, but the Steam version includes a digital artbook and map.