The 'Lord of the Rings Online' Mordor expansion has been delayed.

Lord of the Rings Online

Lord of the Rings Online

Mordor was due to be the sixth expansion for the massively multiplayer online role-playing game and was expected to roll out on Monday (31.07.17), but after discovering an issue which impacted the movement of non-playable characters within the expansion, developers at Standing Stone Games were forced to delay its release.

In a post on a forum thread on the game's website, the developers said: "We are as excited as many of you to get into Mordor, but we have some unfortunate news: we have to adjust the release date. While preparing over the weekend to release the expansion on Monday, we discovered an issue in the build that impacted the ability of monsters and NPCs to move around correctly. This problem was specifically identified in older content.

"While correcting this issue is not a problem, the process to correct it takes too long to be able to release Mordor on Monday. So, we have to adjust the release date. We will have more info on the release date soon. We will know a lot more in the next 24 hours or so, and will pass along the info as soon as we can. (sic)"

As of the time of writing, no new release date for the Mordor expansion has been announced, as further details are expected to be released in the coming days.

The expansion is expected to include more than 300 new quests and "hundreds" of new Deeds, as well as the new High Elf race, a new allegiance system and a new raid, among many other things.

'Lord of the Rings Online' is free to play for Windows and Mac systems, with the expansions available for a fee.

Mordor will cost plays $40, whilst a collectors edition is available for $80, and an ultimate fan edition is worth $130.