Despite her nature Eris has been of some interest to me.
Eris is the Greek goddess of discord and strife. She is Ares' constant companion and follows him everywhere. Eris is sinister and mean, and her greatest joy is to make trouble. She has a golden apple that is so bright and shiny everybody wants to have it. When she throws it among friends, their friendship come to a rapid end. When she throws it among enemies, war breaks out, for the golden apple of Eris is the Apple of Discord.
Because of Eris' disagreeable nature she was the only goddess not to be invited to the wedding of Peleus and Thetis. When she turned up anyway, she was refused admittance and, in a rage, threw a golden apple amongst the goddesses inscribed 'To the fairest.' Three goddesses laid claim it, and in their rivalry brought about the events which led to the Trojan War.
She was often represented specifically as the daimon (spirit) of the strife of war, who haunted the battlefield and delighted in human bloodshed.