Pillars of Eternity features three game modes: Trial by Iron, Expert Mode, and Path of the Damned, that players seeking extra challenge can opt-into at the beginning of each game. All three modes are optional and can be combined together in any combination on top of the standard difficulty settings.
- Expert Mode - Enable more punitive and demanding game-play elements, in and out of combat, including all the individual options above. The mode is similar to Fallout: New Vegas' Hardcore Mode, Expert Mode.[7] Because it disables all of the common ease-of-use "helper" information, it is regarded by some players as the most realistic way to play.
- Trial of Iron - The player has one save game that persists for the entire campaign... or until player characters die.[7] Trial of Iron save games are distinguished with metal textures instead of wood.[8] when you quit your current state is automatically saved and you can re-enter that saved game to continue playing. However, if your party dies, the game ends and your save is deleted — you must begin a new Trials of Iron game.
The mode is similar to Temple of Elemental Evil's Ironman Mode. It is likely a wink to classic CRPGs of the 80s, intended to restricting any reloads to counteract regrettable decisions, thus increase game difficulty, making it harder for players to abuse save/load to get the results they like also known as Save Scumming. - Path of the Damned is a spiritual successor to Icewind Dale's Heart of Fury mode. In the encounters, individual combatants will be turned on and off based on the level of difficulty. In an area on Easy, maybe casters are replaced with weak melee enemies. On Hard, maybe the casters are augmented by a tough melee enemy or two. With Path of the Damned, that goes out the window. All enemies from all levels of difficulty are enabled and the combat mechanics are amplified to make battles much more brutal for everyone involved.
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