Why the admin could actually be Soren or why Ellegard might have a connection?
So by this point in the game we have seen a lot of crazy and out of the ordinary objects but we never really know of their origins, and the only people who we have really seen actually have an involvement making these objects are Soren with the formida-bomb and the command block (sure he said he found it but that's obviously total bs) and Ellegard tries to actually make a command block.
Now back in episode 2 of season 1 the other order members (Ellie, Magnus and Gabe) are discussing the F-Bomb and I believe that they mention Soren often dealt with and made impossible objects and it's hinted at that Ellegard was also apart of that a bit.
So we do see other objects like the eversource crown, pama's heart and that enchanted book thing from episode 8 but I don't think they made them, Soren must've.
Soren does mention being betrayed by "them" it's not the old order that did this, it has to be the old builders, after all wasn't Harper kinda kicked out of the old builders or something like that? Also we Soren's books in the other worlds.
Lastly don't forget how Soren had statues of the 4 members of the order in his temple which are around the same size of those in the sea temple and Soren truly does care for his friends, so maybe when making the sea temple statues the design was influenced by Gabriel and his armour
So many connections which can make this Soren