Sekhmet is one of the Witches of Sin, being the Witch of Sloth. As her position suggests, she can be summed up to being extremely lazy, enough that she finds breathing to be a pain.
Spoiler Sekhmet's main ability is "Authority of Sloth". With this Ability, Sekhmet is able to use a more advanced and improved version of the unseen hand used by Petelgeuse. Unlike Petelgeuse her unseen hand is able to hit individuals and objects with an invisible force without her moving and he can use this power in any direction she chooses. She is cited from Echidna to be the strongest of the witches of sin besides Satella