Vedalken Eldricht Knight

[RogueJK]

With a 13 WIS, Tempest won't be giving you much nova damage, and Spiritual Weapon won't be very useful either. Your +1 WISMOD will cause your spell DCs and attack bonuses to be pitiful, especially since it's going to be Tier 3 before your Tempest Cleric damage spells start to become available.

So either way, if you go Cleric/Sorcerer/Wizard after EK 8, you're going to have to stick with spells that don't rely on your INT/WIS/CHA score. That means no attack spells or save spells. Stick to utility spells, defensive spells, and buff spells. But you'll primarily be using upper level spell slots to upcast Shadow Blade anyway.