This page may contain some of the same content as the Marvel Database article. A more complete and current article is at the Marvel Comics Database Styx (Legion Personality) (Earth-616). The complete list of authors can be seen in that articles page history.
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The six personalities headed to Europe and then split up, Time-Sink staying on Tenerife (Spain), Susan and Chain in London and Styx installed himself in Paris Catacombs, followed by Bleeding Image and Endgame.
During their operation in London, Xavier was kidnapped by Styx who left a trail for David to follow him in Paris, where he sent his henchman Bleeding Image and later directly in the Catacombs.
Once inside, Styx revealed his plan and goal: In order to ascends as God, he wanted to obtain Moira's reality warping powers. However, he was tricked by David and Rogue, using Chain to duplicate David on Rogue) and was reabsorbed by Legion after a violent battle where Rogue merged into Legion.
Soul Absorption: Styx can absorb the spiritual essence of living beings on contact, enslaving their souls and leaving their bodies conscious yet subject to his every command. The souls are stored into an unknown limbo.
Mass Mind Control: Styx is granted total control over the beings he had absorbed their souls.
Telepathic Connection: Styx is able to use one of his mind-slaves as a channel to a being thoughts, connecting to them and listening to what the target who is not connected is saying. The breaking of the connection can shut down the channel-body.
Insect Control: Ability to command and control vast armies of flies
Illusions: Styx was able to generate realistic illusions. The nature of those is unknown, as Magneto wasn't immune, still wearing his helmet. Those illusions may be the product of Xavier's powers.
Psi-shield: Styx and the five other sub-personalities are somehow protected from psi-scaning, and even the Omega-level TelepathCharles Xavier was unable to perform a psi-contact on an unconscious Time-Sink. It was stated that this shielding was coming from their specific nature, as they weren't "living beings in the conventional sense".