She has the ability to manifest in the physical world . She was last seen using this ability when confronting Guts in Qliphoth, where she manifested as troll intestines. She could also create monsters out of thin air. Like the other God Hand she can see the future and manipulate causality.

Slan is a sadomasochist who thrives on cruelty and the effect it has on others. Slan appears to have a fascination with Guts, as seen when she manifested in the Qliphoth to confront him, having shown an interest in his incredible strength and fortitude when The Count summoned the God Hand. She stated that if Guts could join them along with Griffith, it would be great. However, this could not happen because Guts was branded and fate had something else in store for him. She seems to be infatuated with Guts as she calls him "Darling", enjoyed seeing every negative feeling Guts experiences. She once tried to tempt him into using the Behelit in his possession. After their short confrontation Guts pierces through Slan (strongly urged by the Skull Knight) to then be kissed by her, as an act of joy and self- contentment. 

A Fem-Fetale sounding voice. Seductive and Mature.