Dave Georgeson, Director of Development on EverQuest Next, sent out a Tweet indicating that players will not only be able to build custom worlds in EverQuest Next: Landmark, but also will be able to fight in it!
I've been asked to leak something. Landmark will have combat elements. Maybe not right at launch, but it's coming. Begin speculation. :)— David Georgeson (@DaveGeorgeson) September 24, 2013
Source: Dave Georgeson Twitter