Lux in the Mid-Year Mage Rework
It mentions in Lux's lore that she is able to instantly reverse-engineer magical spells in her lore, I was thinking this could be an extremely unique twist to Lux in the upcoming rework. This part in her lore made me extremely curious to play Lux but it isn't put into her gameplay at all.
You could change her ult to copy the last mana-costing damaging spell cast near her by allies or enemies, increasing the damage dealt by a % based on her AP, up to a cap. This could make an EXTREMELY fun champion to play as and against.
I mean why have that little tidbit in her lore if you're gonna do nothing with it?