The Master of the Ravewing may be your army commander if you wish. 
Remember  that your army must include at least one model capable of leading it. You may only choose  the Master of the Ravenwing if  one  or  more  squads  of Raveiwing Space Marines are also included  in the army.

If the Master of the Ravenwing is the army commander then any Dark Angel units within 12" of him may use his Leadership value when they take a Leadership test.

Has Deathwing special rules

Deathwing

Cannot be affected by Fear or Terror special rules and are immune to all psychological effects.

Ravenwing

When fired on by the enemy, the to hit modifer for the speed of the vehicle is moving at are increased by -1.

May re-roll the dice if they fail a Skid Turn (Warhammer Rulebook Pg. 83). 

No to hit modifiers when they fire from a vehicle that is moving at Fast Speed

Profiles:

Unit	Unit Type	M	WS	BS	S	T	W	I	A	LD
Master of the Ravenwing	Captain	4	7	7	5	5	3	7	3	10

Modifiers:

set max(roster) 0

and

0 selections of Ravenwing Land Speeder Squadron in roster

0 selections of Ravenwing Bike Squadron in roster

set-primary category Allies

force is Dark Angels - Ally List

Used By (1)

Codex - Angels of Death (Dark Angels)(Catalogue)