Huh. That one isn't ringing a bell, but definitely on the right track. Using Iron Man as the inspiration is fun. And like that one, beings from Mechanus were what I was thinking of for patrons.

I don't know if there's any non-deity, powerful extraplanar creatures in Eberron that would fit the bill, but the DM's campaign I'm playing in is somewhat in the vein of Eberron, so I was trying to imagine what a warlock - that could have such a patron - in that setting would be like.

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