Curse of the Black Widow
Claire has 3 types of curses each providing her with a different immunity, however only 1 curse can be active at a time.
By default the Curse of Blood is active. Landing a fourth Light Attack casts the next curse in the following order.
Curse of Blood: Bleed immunity.
Curse of Plague: Poison immunity.
Curse of Hellfire: Incinerate immunity.