Siege Workshop

"Sometimes guilds come into conflict with one another, and when they do you're going to wish you built a Siege Workshop. The Siege Workshop will unlock special abilities in the Stronghold Siege."

Siege Workshop
A Siege Workshop is a Stronghold structure that increases the effectiveness of your ballista emplacements in Stronghold Siege PvP battles, and unlocks the the Enhance Overload: PvP Slayer Boon at Rank 3, and the Enhance Overload: Stamina Drain Boon at Rank 5. A Siege Workshop may be built at any Support Structure plot.