Fluff is the story behind the battle, have you never heard of it? :\
Here is a army for a 5000 pt game in my area, I still need something to do with it (I just got like, a bazillion pts)
5000 Pts - Chaos Marines Roster
Formation: Defiler Assault Force (5#, 865 pts)
1 Defiler Assault Force @ 865 pts (Defiler; Defiler)
--------5 Defilers
Formation: Cult of Destruction (9#, 825 pts)
1 Cult of Destruction @ 825 pts (Obliterators; Obliterators; Obliterators)
--------9 Obliterators (3 groups of 3)
Formation: Doombringer Annihilation Force (16#, 985 pts)
1 Doombringer Annihilation Force @ 985 pts
1 Chaos Terminator Lord
3 Terminators
3 Terminators
3 Terminators
3 Terminators
3 Terminators
Formation: Lords of the Black Crusade (8#, 1385 pts)
1 Lords of the Black Crusade @ 1385 pts (Abaddon the Despoiler; Chaos Lord; Chaos Lord; Chaos Sorcerer; Chaos Sorcerer)(They all have terminator armour)
3 Terminators @ 135 pts
3 Terminators @ 120 pts
3 Terminators @ 120 pts
3 Terminators @ 125 pts
3 Terminators @ 110 pts
3 Terminators @ 145 pts
Total Roster Cost: 4815
I need more pts, but I am trying to stick with an all tele army.