Silicce was lady Delis spoke about when Xue Ren had small adventure to the black clouds.
She was the only one to tame the panditur and use its body to fight. It was good as the panditurs had natural born resistance against the lightning and she also could use the black clouds within its mouth to regenerate her own.
It was strong combination and the lady had slow lightning as her primary force.
So it was even more stronger this way. The combination of lightning lady and beast was good and it piqued interest of many, but no one was truly strong enough to tame the beast.
Nevertheless, as the beast was good comapanion to rely on, it was also one of the weaknesses for Silicce.
"The beast got corrupted and before she could realize it, her body got attacked by it."
Xue Ren spoke as everyone was in his own world. After taking her here, he disappeared from the lightning forest of life in a flash, so that he can calmy help this lady.