Defeating all 4 of the Abyssal boss fleets - 2 Elysian, 1 Dawntide, and 1 Duskborne - from the then-current 1.1.1 version of The Knights of Ludd mod. Not too tough for a maxed-out modded fleet with a piloted supership, but they will definitely pose a lot of trouble for less-prepared fleets.
(I forgot to show this during the fleet showcase, but I've also equipped a Random Assortment of Things artifact, the Hyperenergetic Generator, that boosted the flux dissipation of all ships in the player fleet by 10%)
0:00 Fleet Showcase
2:20 Amaterasu: Pre-Battle
3:01 Amaterasu: Battle
7:46 Amaterasu: After-Battle Report
8:51 The Devourer: Pre-Battle
9:31 The Devourer: Battle
17:21 The Devourer: After-Battle Report
18:18 Yukionna: Pre-Battle
18:57 Yukionna: Battle
25:58 Yukionaa: After-Battle Report
26:50 Corrupting Heart: Showcasing New Fleet Additions
27:20 Corrupting Heart: Pre-Battle
27:52 Corrupting Heart: Battle
38:54 Corrupting Heart: After-Battle Report
** Relevant mods used **
Audio Plus
Combat Chatter
Detailed Combat Results
Exotica Technologies: Kaysaar's Toolbox Theory Edition
Flux Reticle
GraphicsLib
Hazard Mining Incorporated
Interstellar Imperium
Iron Shell
Knights of Ludd
Officer Extension
Random Assortment of Things
Secrets of the Frontier
Ship/Weapon Pack
SpeedUp
Starship Legends
System Marker
Too Much Information
Volkov Industrial Conglomerate
WhichMod
WhichTMI