I have just had an epiphany today. I think I have just realized another aspect of the Prince class. It might be coincidental, but still... I always doubted that Prince is the same as Bard. This is probably all speculative bullshit, but I need to share it.
IDE: the Prince class will oppose/subvert the aspects of others they interact with, including themselves.
So, let us list out the people Eridan had explicitly interacted with in the comic:
Himself
Feferi Peixes
Karkat Vantas
Sollux Captor
Jade Harley
Rose Lalonde
There are the others, of course, but they're not very important. Let us see here:
Eridan: The parallel of the Prince class with the Bard, as stated countless of time. Eridan destroyed the matriorb, destroying the hope of the trolls reproducing. End of story.
Feferi Peixes: Feferi was a Life player. Instead of knocking her out like Sollux, he just hope-blasted her. She is now a dead player.
Karkat Vantas: This one is a bit of a stretch, but Eridan (and other trolls), messed up the structure of Karkat's memos by talking on them. It was speculated that Blood has to do with structure and leadership.
Sollux Captor: Instead of killing Sollux, Eridan knocked him out. Of course, the latter didn't know the former was still alive, but that's neither here nor there. Sollux was Doom player, he kept harping about the impending doom and that other bullshit. When he was blinded, the voices stopped, and he finally cheered up for once. His ability as a Doom player was negated.
Jade Harley: Nope, he barely does anything with her beside pissing her off. I have no idea why I included Jade, but he sure isn't giving her enough space... *shot*
Rose Lalonde: Eridan was not directly involved in Rose going grimdark, and as speculated, turning into the Witch of Void. But it still should be noted that he talked to her before she was subverted.