Empire, being the first of all game modes, is one of the only modes in which there is no limit to how many players may join. The map is based around a medieval styled fort with special guests such as Squidward, Mr. Krabs, Zingys, and the toblerthrone.
All users are on their own on Empire with free range to kill anyone without a time limit or score limit. A Royale Sniper is on the ground in front of the spawn point for anyone to pick up. Empire is the perfect mode for practicing skills on your own or against your buddies.
This mode is still currently unfinished, hence why there is an "Under Construction" sign in the middle of the map.