Dam Seek is the final boss of Doors floor 2 (The Mines) appearing at Door 200.
As we see at the end of Doors Floor 2, he is seen to be suspected of being the Main Character at Floor 3 (The Castle).

<infobox layout="stacked">
<title source="title"> <default>Seek (Dam)</default> <format>Dam Seek</format> </title>
<image source="image"></image> <group layout="vertical" show="complete"> <header>INFORMATION</header> <label>Type</label> <label>Behaviour</label> <label>Floors</label> <label>Damage</label> <label>Profit</label> <label>Health</label> <label>Spawn Rate</label> </group> <group layout="vertical" show="complete"> <header>ADDITIONAL INFORMATION</header> <label>Date Added</label> <label>Creator(s)</label> </group> <group layout="vertical" show="complete" collapse="closed"> <header>SOUND FILES</header> </group> </infobox> He has 3 Stages, and on Stage 3, he is shown to summon some "Ink Fish" of his.