Abilities:

True Fulfillment - Mind Controls someone giving them a damage boost and they grow larger.

Shock - Deals up to 2.6k damage. This is cast when no players are in melee range.

Blink - Blinks to a one of three set places.

Arcane Explosion - Instant AoE attack dealing up to 1.5k damage. Only cast if more then 4 players are in melee range.

Boss Fight:

Skeram has 3 stages, the stages are at 75%, 50%, and 25% HP. Each time he goes to the next stage he will create 2 clones of himself that have much less HP then him but deal just as much damage.

Each clone spawns with the prophets HP. There are 3 spots in Skeram's room where the clones can spawn, Skeram will also teleport to one of these 3 spots. DPS down the clones before returning to Skeram.

Skeram has a Mind Control spell that is cast on a random player close to him, sheep/fear whoever is mind controlled to prevent them from killing the raid.

To prepare for Skeram clones put one tank one each of the spawn points and have them ready to grab aggro when possible. If you split the raid into 2 even groups you have healers on the tanks without having to move at all.

Also remember to keep Skeram away from your ranged classes/healers/casters as he can destroy them with his arcane explosion.