Considering their themes, I would suggest the folowing:
Abyssal/Infernal Warlocks: fiery, acid, powerful, trickness
-Lose Ice Storm, or its changed to a Flame Pillar or something fire related (could be a new spell effect with damage changed to fire). Maybe the spell Aura of Hellfire on him and summons (fire is very easy to resist so its not as strong as it seems).
-Gains Cloud of Bewilderment.
Fey Pact: cold, air, darkness, trickness
-Gains Ice Storm at 28. It simply fits their elements.
-Gains Darkness, Ultravision and See Invis too.
Warlock Spell suggestions
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