The intriguing Nemesis system in Middle-earth: Shadow of Mordor will not make it into last-gen editions of the game.

In Shadow, players will face unique enemies that are differentiated by personality as well as strengths and weaknesses.

Through the Nemesis system, enemy relationships and characteristics will be shaped by player actions and choices, and archenemies that remember and adapt to the player will be created.

Speaking with IGN, design director Michael de Plater said the development team was focusing its efforts on PlayStation 4 and Xbox One, and would retrofit as much as possible into the PlayStation 3 and Xbox 360 editions.

“We’re very focused on the PS4 and Xbox One,” he said. “We’re focusing on the next-gen platforms, and then going to do whatever we can to get as much as possible on current-gen.

“To break it down, some of the stuff we’re pretty confident will still be very similar on current gen: the core mechanics, like combat, stealth, ranged and movements; the basic control and gameplay, that should all be really solid. What it won’t have is the same level of depth and variety and simulation within the Nemesis system.

“The story will be the same and the core gameplay will be the same, but the Nemesis system is just so huge in terms of content, calculations and AI we’ll just have to try and get as much of it in as we can.”

Players will take on the role of Talion, a valiant ranger whose family is slain in front of him moments before his own life is taken – the same night Sauron and his army return to Mordor.

Resurrected by a spirit of vengeance and empowered with wraith abilities, Talion ventures into Mordor and vows to destroy those who have wronged him. Through the course of his personal vendetta, Talion uncovers the truth of the spirit that compels him, learns the origins of the Rings of Power, and ultimately confronts his true nemesis.

Middle-earth: Shadow of Mordor is expected to release later this year.