So I got both of them, I got Hwa too. Hwa is very straightforward for me, I'm planning to use her in dungeons ( DB10 - TOA ) so I runed her Vio ( SPD / HP / ATK ) and she's not skilled-up. I got Yen and Su too, they are just 5* at the moment without any skillups. Both are on Swift / Blade ( SPD / ATK / ATK ). So what are their uses? should I keep them both and what general advices can you give me about them regarding anything ( runes, skillups, usage, when to 6* etc... ) Thanks!