D&D4 Wiki
Fading strike
ranger attack 1

Special: If a character has the Hunter Fighting Style option of the Fighting Style ranger class feature, the character can use fading strike instead of the melee basic attack part of an opportunity attack action.

Target: one creature

Attack: Dexterity vs. AC

Hit: "1[W] + Dexterity modifier damage, and you shift 2 squares to a square that is not adjacent to the target.
"Level 21: 2[W] + Dexterity modifier damage."[MP2:33]

Fading strike is a 1st-level at-will attack power available to rangers.

The attack allows the use of a melee weapon or a ranged weapon, but using either one you always use Dexterity as the attacking ability score.