Pact of the Blade is not a spell, so you can use it while Raging. The same goes for Lifedrinker and Thirsting Blade.
Eldritch Smite is also not a spell, so it can also be used while Raging. Rage says that you can't cast spells, not that you can't use spell slots. Using spell slots for things other than casting spells is perfectly fine.
I understand with Rage you cannot cast spells and you can't concentrate.
But can the Eldritch Invocations like Pact of the Blade still be usable (before you rage)?
What about Lifedrinker and thirsting blade?
I assume if raging you can't use Eldritch Smite as that uses a spell slot.
Pact of the Blade is not a spell, so you can use it while Raging. The same goes for Lifedrinker and Thirsting Blade.
Eldritch Smite is also not a spell, so it can also be used while Raging. Rage says that you can't cast spells, not that you can't use spell slots. Using spell slots for things other than casting spells is perfectly fine.
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