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 FelguardLevel 50Your Felguard deals about a fifth of your damage: 20% more attack power matters a lot.
• Glyph of Quick DecayLevel 15Corruption sped up by haste: more Molten Core procs.

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 MetamorphosisLevel 60Instead of Glyph of Felguard if your Felguard cannot attack during the fight.