PVE DPS Unholy (20/0/51) (WOTLK spec)

Best Raid DPS Spec

This spec is great for leveling and focuses on control.
Proper Glyphs: Glyph of Icy Touch - Glyph of the Ghoul - Glyph of Bone Shield
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Arena PVP Unholy (18/0/53) (WOTLK spec)

Best Arena PVP Spec

This spec is the best arena pvp spec.
Proper Glyphs: Glyph of Bone Shield - Glyph of Anti-Magic Shell - Glyph of Icebound Fortitude
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Unholy-Frost Dual Wield Spec (0/32/39) (WOTLK spec)

Great Death Knight DPS Spec

This spec is great for leveling and focuses on control.
Proper Glyphs: Glyph of Icy Touch - Glyph of the Ghoul - Glyph of Bone Shield
Download this guide on how to make tons of gold without getting banned.