The Wall
This level has one real easter egg, a sort of easter egg, a few unused lines, and a cool little bit of scripting.
On the island to the north, you will find a model resembling one of the statues from the real-world Easter Island. In fact, they are even named as such in the tags.
This little hut to the far south, on the west bank of the river, plays a continuous loop of "Bungie Bungie Bungie Bungie Bungie Bungie Bungie, [marching band music] BUNGIE RULES!" The song is called "bs" (for "Bungie Song", get your mind out of the gutter), and is within the sound tag "island".
At the very end of the level, one of your archers will say "That HAS to be it, right?" after defeating a big wave... and then these fellows sneak out of the river and ambush you.
Finally, there are two unused subtitles: "It's going to burst. Run!" and "Great view from up here!". It's not known who says them. Also of note are a couple different "Damn!" sounds that your archers will choose from during the level: anxious, exhausted, frustrated, and impressed.
Written and compiled by Forrest.