Strongholds is the game’s seventh expansion, and it allows guilds to claim and fortify an abandoned keep on Neverwinter’s largest map. Guild members will battle the surrounding environment to acquire resources while simultaneously building siege structures designed to wage war against enemy guild keeps in the new siege PvP mode.
The siege mode combines two stronghold maps and doubles the scale, according to a Perfect World press release. Siege mode also adds a three-lane MOBA-style battlefield that supports 20-vs.-20 combat.
You can view a trailer for the expansion after the break.
Source: Perfect World press release