Voldemort is a level 777 Boss with 66,666 Hitpoints. The only effective methods of dealing damage include Ranged or Magic. Melee will not do damage to him. He has multiple unique attacks, which include some of the following: Magic; Ranged; Lightning; Water; Fire; Black Magic...
Voldemort starts off with 1,000 mana points. Every attack will detract a random amount of mana points. A number between 1 and 200, it will be completely random every time. When Voldemort's mana reaches 0, the next attack he will do is a charge attack, which can heavily drain your prayer. Note: most of the blue fire attacks tend to drain your prayer or it will do severe damage. The closer you stay to the boss the more chance you have of getting attacked by his barrier spells, which consists of elements that can have a special effect on you. Barrier Spells include some of the following: Ice, can Freeze you; Fire can Burn you; Lightning can Destroy your prayer.
Upon killing Voldemort you will need to be part of the top 3 damage hitters in the raid to receive loot from the kill.