Zardnaar
Legend
Yep! The trick is primarily to pick the right spells for this. Non-Fey Warlocks (who can do this trick in the other direction, IIRC) would likely look to misty step, especially if they're a fragile Blade Pact user who needs to get away after smacking someone around. Hex is of course a reasonable if less-than-impressive option once you're level 11+. Genie gives you sanctuary, which pairs doubly well with something like a pre-cast blade ward (which is actually amazing in 2024, other than needing Concentration)--nearly unhittable and even if they do hit you they have to pass a save or (potentially) lose the action. The new Hexblade patron offers staggering smite, which might be a solid choice in the right context.
Alternatively, if we can pick any bonus-action spell (perhaps acquired through a feat or some other special source), arcane vigor is a possible option. Your magic weapon being innately upcast to 5th level means you always get a +2 weapon out of it, and it's not Concentration, so that could be powerful for a Blade warlock. Or if you're a support-focused Warlock--perhaps with Celestial patron--healing word wouldn't be a bad pick. (Really nice if you can pick up the Dragonlance feat Divinely Favored as your Origin feat.)
Wife went celestial. She stuffed on everything and used spirit shroud with 5.0 Gith.
Aid stacks with heroes feat. Warlocks can get lots of origin feats. Toughness........