Anivia Rework
Passive: Winter Boon
Chill: Anivia's damaging abilities inflict Chill for 1.75 seconds, slowing by 25% plus 5% AP.
Rebirth: While below 25% health, half of mana spent becomes gray health which lasts until an ability hasn't been cast for 20 seconds. Upon reaching 0 health, Anivia's gray health is converted back into health. Once healed, this ability goes on cooldown until all of Anivia's basic abilities become available to cast at the same time again. Anivia's gray health has a cap.
Q: Frostbite 12/11/10/9/8s cooldown Cast a frost bolt that deals damage to all enemies it passes through and stops when it hits an enemy champion, dealing increased damage and Chilling. Deals double damage to enemy champions already Chilled by Anivia's abilities.
W: Crystallize 20/18/16/12/10s cooldown Create an outwards curved wall of ice perpendicular to you that blocks movement and lasts up to 4 seconds. Crystallize can be reactivated early to break the wall.
E: Flash Frost 12s cooldown Call a frost nova down on the target location, dealing magic damage and Chilling enemies after 1.1 seconds. Enemies already Chilled are stunned for 1.75 seconds.
R: Freljord's Breath 120/100/80s cooldown After 1.1 seconds, deal significant magic damage to enemies in a broad and long path before you, Chilling them for 2.5 seconds. Enemies already Chilled take true damage instead.
Essentially Anivia now functions similarly to brand, where all damaging abilities are influenced by the effect your abilities inflict, meaning your combo is everything. Do you go Q to slow to land your stun to guarentee your ult, or do you slow with E so you can crit with Q and follow up with ult for maximum damage? There are many more combos now than just Q into E. Your W supplements the fact that you won't have a slow to help land your first ability. It can help wall people into an E or ult. All of Anivia's abilities have a large delay or can miss, meaning it's challenging to hit the first ability, but because of the slow applied, the remainder of your abilities can be landed more easily. Your passive makes you a monster vs sustain damage enemies who can't burst you 100 to 0. The longer they have to leave you on low health, the more of it you're going to get back when they go in to finish the job. It won't heal you for as much as it potentially could before, but now it's less likely to get you killed and it has more play built around Anivia's "revive."