Oh boy I hope I find something cool he-

I came looking for silver, and I've struck shit colored gold. For context, these are the Plagueseekers from (torched)Seeker, more specifically Cataclysm fleet. Cataclysm is the big boss of the mod and formidable...unless you cheese the fuck out of it because all it's firepower is in its sides, but be wary as it can turn very fast and so can its turrets. Nothing a Doom with Phase Anchor can't handle, your best bet is to wait for an opening where the largest number of fleets are away from Cataclysm, you can wait quite a while as they are neutral...usually.
It's worth noting that the vast majority of the fleet are mostly frigates and smaller, also worth noting is that you cannot normally recover the Cataclysm as it will turn into a station for you to use and has some goodies in it, you'll have to use console commands or edit the ship's file so it's boardable like I have. The other ships are free game, and do not use Plague weapons on normal ships as they reduce combat readiness by a few points but nothing terrible, hardened subsystems halves it. There may be three other bosses but they might not be implemented? I've only ever seen them in the files and only ever spawned them.

This one is called Rogue Star, the White Dwarf class ship and it seems to be a Remnant turned Plagueseeker ship that looks God damn sick. It also has a face of sorts if you look at the middle. Great frontal damage but has great 360 coverage and even
3 Paladin PD systems. Also has a Heavy Phase Grazer which causes it to glow and "dash" to a close by location on top of reducing flux quickly.

This one is called World Eater, the Rampage class ship. Strudy as fuck, hits like a
World Eater, has a missile autoforge on top of that, and has a unique ability called "ram." It's exactly as it sounds like, faster burn drive. It stops, glows orange, and burns towards where it's looking and smashes into whatever is in its way. It's a fucking unga bunga ship. I haven't noticed the ram manuver having any other special properties compared to the burn drive, just faster with a short windup, but due to its mass and speed it'll overload or outright kill what it hits dead on. Worth noting that this ship and the White Dwarf are called "Corrupted Titans." They both have fleshed out descriptions but the World Eater's ram ability has none, leading me to believe it's still a (fully functional) work in progress.

The last one is called the...in the files it's called the Nova but in game it's called the Horizon. Frontal firepower and drones up the ass, can move well with Plasma Jets, it's good at sustaining fire and suppressing ships. It's pretty good, wouldn't really take it over a Radiant but the AI might not be utilizing it enough, or maybe it's the loadout, will test it out more.
And of course Cataclysm itself. Insane Hull, insane armor, insane DPS, great speed, great turning speed, great flux, slow as fuck shield spread, can solo most
fleets in the game, period. I used it and watched as it shredded a Heg fleet without taking a single point of damage. Not some silly little tax fleet, some end game fleet you'd expect to see during an all or nothing battle over their capital. For a test run I spawned a 1000 DP heg fleet with some super ship mods (mostly Missing Dreadnoughts) and good God did it fuck.
Boy, did it fuck those tax cucks up. It was very good at maneuvering to spread the damage across it's armor evenly so that they never focused on its most damaged parts, it used its shield well, managed its flux perfectly so that it could never stop firing but didn't

let the shield take too much damage and overload it. It picked off smaller ships and tripped up capitals on each other so it can duel one or two at a time (which it did very well). At the end of the battle it lost pretty much 99% of its armor, but funnily enough lost about 1% of its hull.
It took out most of the fleet, I hope some of you can recognize most of these
ships because good God they were destroyed. Again, this was a
1000 DP fleet I spawned in, I've used all of these ships before and they're pretty fucking tough when used right, and in a well organized fleet forget about it. And this fucker took them all on and won with barely any hull damage. I can certainly see why this is normally unobtainable. "Weakest modded ship" indeed, tempted to put it up again some other super ships at a later date. I did once put it up against a "minor" Omega fleet, I say minor because it was small but was 300 DP. Any higher with the mods I had installed and God damn it would be overkill. It could barely handle the Omega fleet with their zippy ships, just like it can barely handle ships it couldn't outright hit like I did with the Doom (I'll be honest I may have been a few Afflictors with reaper torpedos that I jumped into whenever one of them died but I can't remember). So when fighting it, phase and fast ships are your friend, never face it head on, have some heavy duty ships distract so it broadsides them and hit the rear or the front, preferably the rear. Or just throw another "average mod ship" or two at it. Good hunting.