http://ddragon.leagueoflegends.com/cdn/img/champion/splash/Zilean_5.jpg http://ddragon.leagueoflegends.com/cdn/img/champion/splash/Elise_3.jpg
Zilean is from Urtistan and lives in Piltover, and Elise is from the Shadow Isles. Neither of those 2 is (obviously) from Ionia. Therefore Diana is eligible to have a Bloodmoon skin.
Nope. We'll not make a Blood Moon Diana for irony's sake.
It's based around Ionian culture jackass
parallel world
And Kalista and Thresh are Shadow Isles. The only Blood Moons from Ionia are the three Ninjas and Yasuo.
It may be less offensive to give Diana that skin now given the updated lore.
Riot: You know, your right, we really should give a blood moon skin to the champ we've denied one for a while now. So we are proud to present, Blood moon 
:^)
