Tactics
Whereas other armies in Warhammer 40,000 may take to the field of battle for a variety of reasons, the Dark Eldar are depicted as venturing into 'realspace' for the sole purpose of piratical raids. Their armies reflect this, with their vehicles emphasising speed over armour protection. Their warriors generally are also lightly armoured compared to those of most other armies, but are able to move faster. As with the vehicles of other armies, players may pay points for upgrades such as, which allow them a small degree of protection, or "Night Shields", which reduce the enemy's effective weapon range.
In the game, a large proportion of their units have exceptional initiative, one of the best in the game. For example, Leith Hersperax has initiative 9. However, they are a very weak race, with quite low toughness and strength. If they are kept out in the open, they are going to die!
Read more about this topic: Dark Eldar