>>537949137
The basic rules were not established in either case, so it's impossible to determine a clear winner in either case. In terms of technique, Lae'zel would be favored because she is considered an excellent swordswoman even among a culture that trains with the sword from early childhood. Since we're not talking about arbitrary mechanical limitations, she would also know how to parry like all her peers. Karlach has more real combat experience as a decade-long veteran of the Blood War, but that experience was built against infernal fodder, not disciplined warriors who can match steel with steel. She also had a functioning engine powering her in Avernus - outside of it, she might be wary of going all-out, and that would limit her. It would be a pretty close duel, and the intangibles such as who's more desperate would matter more than raw power or skill.