game type: RPG (or MMO)
boss name: Dhallus Thall
looks (Human): face of a 40-50 year old man, waist length blue/white hair. Massive scar covering right side of the face (concealed by hair outside of fight). Eye patch over the left side. Wears light mail body and leg armor, but plate mail shoulder pieces. A tattered cloak is wrapped around all of this. He wields a Scythe.
Looks (Demon): Step one: Picture a wolf without fur. Step Two: Cover said wolf with dark purple/black scales. Step Three: Add a "tribal" tattoo across 90% of his body in gold ink. Step four: remove his left eye, and begin an end his tattoo at his right eye. Add bat-like wings, without the "webbing"
back story: When he was a kid, his father was assassinated by "The Prise", a group of angelic creature that watch over and protect the world. (His father was a terrible man, before he was born), and he vowed he would exact his revenge. Fast forward a "few" years, a power trip leading to him getting possessed by a demon impersonating his father, and him killing the protagonist's family to get possessed, and you get too...
Stage: The sky palace throne room. A typical throne room, but the walls only chest high, and the throne room is crashing towards the earth.
special moves / mechanics: He will use a powerful diving attack that has a high chance to OHKO a party member. His standard attacks cleave(hit multiple targets). Summons spirits of the dead to attack. Causes spike to shoot up from the ground, impaling anyone standing in the area too long. After a while, Dhallus becomes too weak to fight both the protagonist AND the demon inside him, and he gains his demon form. He now attacks with claws, faster but single target. Shoots dark energy instead of his OHKO attack (this attack "cleaves"), and he will mind control party members.
how does the player kill me?: RPG = Blast away, and heal. During certain points, the protagonist had to use certain abilities to protect his team. MMO: Human Form = tanks in front, everyone else behind. Move out of the spikes. (his OHKO is now 75% of current HP + a nasty DoT), demon form = spread out for the dark energy, and stay out of spikes.
He's the final baddie in the game. He's not really meant to be a HUGE challenge, but he does put up enough of a fight to give inexperience/careless adventurers a taste of death.
Note: This is not "Me" (As I'm only 23), but my current internet handle is named after this guy, so...