Milambus

Hi Milambus, it's not really a complete build. I just noted down the necessary ability scores, feats and powers:

Genasi Tactical Warlord / Kensei / Demigod; multiclass Fighter

Str 28 (+24)
Con 14 (+17)
Dex 12 (+16)
Int 28 (+24)
Wis 14 (+17)
Cha 10 (+15)

Feats
L1: Tactical Assault
L2: Student of the Sword
L4: Novice Power (Anvil of Doom)
L6: Weapon Focus (hammer)
L8: Power Attack
L11: Combat Commander

Key Powers/Actions
R1: Use Own the Battlefield to slide Orcus into a position where the other party members can reach him easily.
R2: Use Lead the Attack on Orcus.
R3: Use Anvil of Doom to keep Orcus stunned.
R4: Delay until the start of R5, just before the Rogue's action, then use Sudden Assault to give the Rogue a standard action. The Rogue uses Knockout to render Orcus unconscious, and follows up during his own action with a coup de grace Assassin's Point.