It is highly recommended to read my first story "Alone" before reading this one.

A tale of revenge from three different points of view.
Derpy's dad,(Robert) a stallion with a thirst for revenge. He has nothing to lose, and everything to gain.
Kozac, a tormented unicorn colt who just can't take it anymore.
Derpy, a mare happy with her current life, until an old foe comes back seeking revenge.

And if you're wondering about the title it's revenge in Spanish.