Kassadin's been having a great time now that he's able to stack multiple Tear of the Goddess items. We want to preserve his high late game damage and mobile scaling fantasy, but we want to balance those strengths with appropriate weaknesses.
Our Void Walker has been limping around the Rift more than blinking. Stackable tear items have provided an additional cool late-game fantasy option besides pure AP, but his early game has been tougher than usual. These changes should help his laning, both in farming and trading.