Haste

PnP Description (most of this translates directly to DDO):

Differs from Expeditious Retreat, which increases running speed by 25%, but not combat speed. Expeditious Retreat, however lasts some ten times longer, and uses half as much mana.

Differes from Shadow Walk, which increases running speed by 50%, but not combat speed. Shadow Walk, however lasts some ten times longer, uses 35 mana, but also makes you hard to hit.