You first awoke in a dark chamber having freshly came out of a womb and a dark voice cackled out "Finally my heir! Time to start raising him!" You noticed some energies in the surrounding area entering and nourishing you.
A woman next to you said "Yes our S-" the woman started chocking.
The dark voice angrily said "Our? What is this Our? He is my Son and regardless you are now useless. You have grown the boy in the womb and now the energies in my castle can sustain him alone! Your tits are useless and you have no more uses for me!" Then the woman next to you stopped breathing leaving you in the darkness with a figure who seems to have been your father. The guy said "Well now I suppose time to start with tradition! I've got your Warlock mask my young one... Let it be engraved in your face forever and change as your magic adapts." Then a black hand with something in it's hand clamped something down on your face as his dark magic welded the item onto your face as you scream from the agonizing process. The person who you assumed was your father said "Be thankful you had it welded early when you'll have forgotten the pain and not in childhood."
Time passes and your childhood was secluded for a lack of other words. You were protected by your father's undead minions in his castle where you studied his warlock magic. Some curses that interact with the living in interesting ways... or just wither them till they die, some undead animation spells, and some transformations spells that you found interesting for one reason or another. From your father you heard that a Warlock's spells influence the shape their mask takes. Your father's mask was a skull and he did end up bringing death and undead around with him most places he went... or so he said since you were trapped in his castle while you were growing up.
On your 16th birthday you wake up. Your body looks similar to a human although the stone mask that was welded onto your face when you were a baby looked like a coiled up serpent. Then there's the fact that your skin was nearly as pale as a ghost and you always wore long black robes hiding your scrawny figure. You walked your way to your father's library where he was reading a book on the secrets of dark magic. You asked "Father today you have asked me to do you a task outside the walls of the castle. What would you have me do?"
Your father said "Anxious to get outside for once are you? Well I've been noticing your powers growing and have decided you needed a test. There is a village I have surrounded, I could just have my minions invade but I think it would be best for you to destroy the village itself. I'll give you a week to kill every living thing inside. If you die... Well i'll still kill everyone inside so I guess your life will be over and i'll have to start over with a new heir. Still you should be strong enough, do not disappoint me."
A small journey latter you were on the outskirts of the town. A Warlock teen in a mask and a dark robe, obviously from the dark warlock trying to kill them who also blocked off their escape and trade routes. They probably would retaliate but there is always flexibility in these situations. You thought up your strategy and decided to...