Tons of NPCs in the game say "Must needs" instead of just "must" or "needs to" to the player. And apparently these lines were given to the English voice actors, who spoke "must needs" because that is what they were given to say.

At first I thought, after hearing a voiced character say it, that maybe it was just some weird style of speaking, but I'm convinced now that this is a major, recurring localization error. "Must needs" never makes sense in any of the lines where I see it.

You see this basically anywhere the word "must" would be used. The word needs gets thrown in there like some kind of tag-a-long.