The Evil God, Rose, is a very difficult deity to "deal" with.
Whether as her opponent, ally, or relative, one must always be wary of her plots and schemes.
Poor Weylun is a prime example of this.
Originally, Weylun was the son of Rose and the Divine Elf King, Corellon.
He was seduced by Rose, who had not yet fallen, to unreservedly release his inner darkness, and he imprisoned the nominal "mother," the Elf Moon Goddess - Shanihan.
Luckily, the latter escaped her confinement and reported their conspiracy to the Elven Gods.
Then, under Rose's leadership, Weylun joined forces with Gewush, the Orcish God, and other dark deities like the God of the Hunt, to launch a rebellion against the Elven Gods.
They underestimated the strength of the Divine Elf King, Corellon, and the war was lost.
Weylun, who was once the son of the Elf King, was exiled to the dark underground, and the strength he had barely accumulated was cunningly stripped away by Rose, who was equally weakened.