Warlock

Major

• Glyph of Life TapLevel 15Keep it up at all times: Life Tap gives you spell power based on your Spirit; cast it before the fight.
• Glyph of ConflagrateLevel 40Essential: Conflagrate no longer removes Immolate from the target.
• Glyph of ImpLevel 15Your Imp deals 20% more damage with Firebolt.

Minor

• Glyph of Drain SoulLevel 15The only truly useful minor glyph: more soul shards without farming them.
• Glyph of Unending BreathLevel 15Slightly faster swimming for you and your allies.
• Glyph of SoulsLevel 68Ritual of Souls costs far less mana before the fight.

Other choices

• Glyph of IncinerateLevel 285% more damage for your main filler spell.
• Glyph of ImmolateLevel 15A good choice against several targets: Immolate and Conflagrate deal more damage.