You can buy this sword from Eldara Dawnrunner, at 47,30, once Revered with Shattered Sun. You can access Isle of Quel'Dana's from a Portal in Shattrath (Terrace of Light).

Other weapons that can be bought at Revered are:

Archmage's Guile
http://thottbot.com/i34667
1h Sword(Spell Damage / Crit)

Bombadiers Blade
http://thottbot.com/i34665
Dagger (Hit / Attack Power)

K'iru's Presage
http://thottbot.com/i34671
1h Mace (Healing / Mp5)

Legionfoe
http://thottbot.com/i34673
2h Axe (Crit / Expertise)

Seeker's Gavel
http://thottbot.com/i34670
1h Mace (Spell hit / Damage)

The Sunbreaker
http://thottbot.com/i34666
1h Sword (Hit / Attack Power)

Truestrike Crossbow
http://thottbot.com/i34674
Crossbow (Attack Power)

All in all something for everyone at Revered.