God forbid DCnu Superman lost an arm, but thats the premise.
Not sure if Supes now has access to Kryptonian tech/the means to clone an arm, but for this scenario he doesnt.
What tech could provide Superman a prosthetic durable enough for him?
Something that could keep up with his strength and invulnerability without being destroyed every few days.
It'd need to allow him to get as close to his original lifting feats as possible.
Survive comparable levels of energy attacks and blunt force as he can.
Any built in defense/offense is optional.
Would any Earth based (to include Atlantean, Amazonian...) tech do the job?
Alien tech? What type?
Would magical be an option?
And this is a superhero message board. Impossible scenarios are par for the course. Unless you think this is the one hypothetical situation in all of comics too outlandish to invite conjecture.