Death Knight

Major

• Glyph of DiseaseLevel 55Pestilence refreshes your diseases with a single Blood rune: more runes for Death Strike.
• Glyph of Vampiric BloodLevel 55One of your best defensive abilities lasts 5 seconds longer.
• Glyph of Death StrikeLevel 55More damage and threat for Death Strike, as long as you keep at least 25 runic power.

Minor

• Glyph of Raise DeadLevel 55No reagent to carry to summon your ghoul anymore.
• Glyph of PestilenceLevel 55Pestilence reaches farther to spread your diseases to more targets.
• Glyph of Blood TapLevel 55Blood Tap no longer costs you health.

Other choices

• Glyph of Death and DecayLevel 55More damage and threat against one or several targets.
• Glyph of Dark CommandLevel 55Until your hit rating is high enough, so that your taunts do not miss.