Follow all the rules for chariots with the following exceptions:
Light chariots can be formed into units. 
They cause D3 impact hits. 
Unit strength 3. 
When shooting at the chariot it hits the character on a 5+

Undead

See page 20 and 21 of the army book.

Profiles:

Profile	Mv	WS	BS	S	T	W	I	A	Ld
Chariot				4	4	3
Chariot Skeletal Steed	8	2	0	3			2	1
Chariot Skeleton Crew		3	2	3			2	1	7

Modifiers:

remove category Special

1+ selections of Tomb King in roster (recursive)

set-primary category Core

1+ selections of Tomb King in roster (recursive)