Riot, when you did Kalista...
Why didn't you guys do Senna instead? First of all, I think Kalista came out okay overall even if I'm not a fan of undead in particular so this isn't meant to knock her. However, that said, it seems like if you wanted an ADC from the shadow isles wouldn't Senna make more sense as she's connected to both Lucian and Thresh? Maybe she could have escaped, maybe she was changed by the isles/the experience, or maybe a little of both happened.
I mean you've got a hook for a champ that ties into existing lore, why not do that?