Originally Posted by Postwave
Presumably he will have Pact of the Blade and/or actually be a Hexblade warlock. The later includes:

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At 1st level, you acquire the training necessary to effectively arm yourself for battle. You gain proficiency with medium armor, shields, and martial weapons.


He won’t be a Hexblade. His patron is depicted right in the banner of this site. That’s a succubus, not a sword.