Belial
Deathwing Terminator Squads
Venerable Dreadnoughts
Land Raiders and
LR Crusaders.
These are the units allowed by a pure Deathwing list per codex canon . Any introduction of either Ravenwing and/or standard codex options and the list loses Deathwing status. Most players also do not consider it a violation of pure Deathwing if a Terminator Armoured Chappy or Libby is included. Although it technically is, the violation is not fundamental and thus I, like others, consider an army with such characters to still be a Deathwing force for all intents and purposes.
There are two primary ways to run
DW: mech and foot.
Mech list example (1500pts):
Belial
Terminator Chappy (Preferred
imho) or Libby
3xDeathwing Squads- the two landraider squads get
TH/
SS and Lightening Claws mix, the unmounted squad gets all
TH/
SS+
CML
2xLRs /
LRCs
extra upgrades as you can fit them
Have the unmounted squad Deepstrike in on an objective and blast away. The
LRs blast away until the proper moment for the squads to assault out.
Foot list:
The benefit with foot is you can get more termies on the board. People disagree with the loadout of the
DW squads in a foot list. The classic was primarily stormbolter squads kitted out for wound allocation benefits. With the
FAQ'd storm shields, people did the same, but included one
TH/
SS termy to catch AP2 wounds. Whittle the enemy down with bolters while keeping them at range and then assault at the opportune moment.
Now many argue that all
TH/
SS+
CML is the only way to go with walkers. Simply walk up the field, blast away with the
CMLs and then bonk the enemy on the head with the hammers. You can
DWA, too, of course.
IMHO VenDreads are only viable in a walking list. In a mech list their lower
AV attracts a lot of fire, as it provides a viable target for all missile launchers and the like which wouldn't have as good as a chance against the AV14
LRs. In a walking list, you can take more which will increase their survivability a bit.
IMO their best use is
MM, flamer and Drop pod. Have them deepstrike and take out armor, tarpit, etc. Just remember
DA do not have the Drop Pod Assault rule, so always take enough VenDreads to make sure you will get some early.
If you open up to including other elements of the codex, the bad news is you lose the bad

, fluffy Deathwing status. However, Doublewing (Deathwing and Ravenwing combined) can provide some more competitive opportunities. Particularly, squads of speeders with
MMs are extremely cheap and effective. In general, most Doublewing lists have Ravenwing fill out an anti-armor role, allowing the Deathwing elements to cover other bases.
The bottom line: Pure Deathwing is very, very cool
imo. It can be difficult to win with, however.