Crestfallen Studios

Throughout the game, we see these three femme fatales talking it up, apparently they all have a connection that isn't totally apparent at first.

Scatha recognizes Cetsa, and despises her

Kloe remembers Cetsa pushing her into the river

Cetsa knows Scatha, and "hates her" as evidenced from Ep2's conversation with Kygar.

Now we can see there's a definite connection between Cetsa and Scatha, and Cetsa and Kloe, but nothing between Scatha and Kloe (because they've never actually met each other). But there's another mystery Slade's mind revealed.

His little sister died. Never explained how. But I present a explanation (apologies if it's been said before)

Kloe is that younger sister.

Scatha and Slade never directly meet Kloe at any point, nor do they even have an idea she exists. The closest we get is the Ballar showdown, where Scatha is too busy focusing on Cetsa.

Why does Scatha hate Cetsa, however?

Because Cetsa "killed" Kloe. Scatha and Slade no doubt know this and it gives them a lot of pain. That's why Slade stabs Cetsa. It wasn't for "justice" or "honor". It was for himself, for his own reasons. What's better than stabbing the woman he thinks killed his sister. And it seems pretty logical that one's sister is dead when she was pushed into the river.
Cetsa probably harbored a lot of hate towards Scatha and Slade for giving her the old heave-ho in terms of treatment after she pushed Kloe into the river.

The age gaps seem relatively logical for this to happen as well. Slade and Scatha/Chasta were in their late teens when Chasta was "sleeping around" and their sister was "killed". We know Kloe is 21 as of now (17 when she left the Blood Lyn + 4 years with Ballar) and it's not hard to imagine that Slade would be in his 30s by now, especially if he's a career Vigilante and Shadow Foot, and was on his way to being a Vigilante Council Member.

And last, and probably least: They all share the same hair color. So, it doesn't hold up, so what?

Same hair colour? Slade has black hair with green. Unless Slade got his hair from his dad, and the girls got their hair from the mother or something like that...

Anyway, that is a fantastic theory. Great work Amgard, that was totally convinicing... Well except for that part when Cetsa says "That's why I HATE her"... I always thought she said that because Scatha was protecting the sword and Cetsa wanted it but Scatha wouldn't allow.

Scatha and Slade never directly meet Kloe at any point, nor do they even have an idea she exists.

Episode 4, fool. Slade met Kloe. Before Slade died, too, although I don't know if that counts.

Honestly, I think simply saying that Kloe and Scatha never met is poor evidence towards her being Scatha's sister.

Heh, True. Its still interesting though. I always find it funny when Scatha and Cesta will have an encounter, and Scatha would call her "Flower Girl"

I've always thought of Slade's hair color as sort of off-blonde rather than a solid green.

And yes, Slade did meet Kloe in Ep4, you're right. However they didn't actually speak to each other, or barely acknowledge each other. Kloe was all like "Rhue, save my ass!" while Slade is like "Omfg I hate you Lexus go not-die." Had they acknowledged each other, there might've been more of a connection. I never said it was evidence that they were related, it's more an explanation as to why it hasn't come up yet.

However, Slade is dead so Scatha will be left to that connection.