Have you actually played DII...?
First of all, it is a disgrace that this flash got the original title "Diablo II" on NG because from what I see, you obviously don't know much about the real gameplay.
First of all, It is easy to tell that your character is a Barb and he wears some sort of horned helm - good judgement there on the helm, but bad judgement on his "attack". I assume you were attempting to animate him WWing, but I guess you forgot that his body pinwheels along with the weapon. Also, where's his BO? Where's his BC??
Secondly, all Diablo says when he spawns is "Not even death can save you from me". He doesn't have a little conversation with you before you fight. You were correct in the gameplay, however, in the quote saying "I will avenge Tristram".
Finally, there is no such item as the "Flaming Golden Axe of Ultra Destruction". It appears to be a one-handed double-bladed axe, so I will correct you on the existing elite uniques for that type of weapon:
Double Axe-->Twin Axe-->Ettin Elite Unique: Rune Master
Balanced Axe-->Hurlbat-->Winged Axe Elite Unique: Lacerator
The weapon in your video appears to look more like an Ettin Axe, so in truth, a Rune Master spawned, you noob. Well, a rune master with a P Em attached to the top and a... F Em (?) attached to the base of the handle, anyway...