Silvani is the queen and aid of Lord Oaks, Champion of the Forest Lord Spawn. She is about twice the size of a normal Pixie.
Silvani will be summoned by Lord Oaks when he is first damaged, as long as she is alive it will be very hard to kill him because he will take very little damage. It is possible to kill him as long Silvani is alive though, it will just take a LOT of damage to do so.
She hits very hard and combined with high magery skills and a high movement speed that makes her a quite deadly lady.
Each time Silvani or Lord Oaks is hit there is a chance that she will summon a group of Pixies on the attacker, these Pixies will attack immediately no matter which karma level the attacker has.
As with most of the creatures from the Forest Lord Spawn, you lose karma from killing Silvani.