Xerath Passive
So Xerath is a Siege Mage, the long range artillery like Ziggs. Thing is siege mages, like Ziggs, are supposed to be careful early game with their poke since it can eat up a lot of mana. So why does Xerath get to be able to continuously sustain himself with a free Q every minion wave due to his passive? That's supposed to be a Siege Mage's weakness until they can get an Athene's/Morelleocon.
Personally I'd change it so that hitting a target with a spell grants him true vision of the target for 3 seconds. This would reward Xerath players for hitting those long range Q's and scoring consecutive hits with his ult while making his laning like every other siege mage. Would also allow him to reveal Twitches, Rengars, Kha's etc.
How does that sound?