D&D4 Wiki
Spectral Vanguard
Bard Attack 17

As you swing your blade, you shout lines from an ancient sage, summoning forth its heroes to lend their aid.

Melee weapon

Target: One creature

Attack: Charisma vs. AC

Hit: 3[W] + Charisma modifier damage

Effect: You activate an aura 3 that lasts until the end of your next turn. While in the aura, you and your allies have a +2 power bonus to all defenses. In addition, whenever any enemy ends its turn in the aura, you can slide it up to 2 squares.

Spectral Vanguard is an encounter power available to bards at the 17th level.[Dr396:31]

It is rated as an average power, with focus on providing basic defense. It doesn't stand out as powerful, but isn't a bad choice. [Charop Bard]