Worked all weekend on sword designs for the BFA, here's a low-res sneak peak
The idea was to come up with something that would feel futuristic, but still be identifiable as a sword. In the story, the sword is found stuck in a rock by some waterfalls. So I've been wrestling with keeping that detail from the story (cuz I think its awesome) and creating a science-fiction weapon - for example, in the future, they obviously wouldn't use plain, old metal swords. If they used any kind of hand-combat weapon, it would have to be much stronger and probably made out of some sort of crazy energy (like Halo's energy sword, or lightsabers from Star Wars). What kind of energy would it be? Light? Plasma? Electricity? And how would the hilt be designed? Would it be bulky? Slim?
All this considered, the sword has to look unique, one-of-a-kind. Its supposed to be a legendary weapon with hidden spiritual power - it can't look manufactured.