Prince Yriel of Iyanden

At the end of every game, Yriel suffers one automatic wound from  his own weapon. Yyriel may take his forceshield save as normal.

Any Eldar army including one or more Autarchs has a strategy rating of 4. While the Autarch is alive, you may shoose to add 1 to your rolls for reserves, regardless of whether he is in play or not (a roll of 1 always counts as a failure).

This special rule is automatically lost by an independent character joining a unit that does not have this special rule, and vice versa.

There are many variants of this rule: Fleet of Foot, Fleet of Claw, even Fleet of Hoof. Title aside, all models with these abilities are treated similarly. In a turn in which models with this rule do not shoot or use a psychic power that replaces shooting, they can move an additional D6" in the Shooting phase, ignoring penalties for difficult terrain.