[Rework] Taric, the Gem Knight

Taric, as a champion, while possessing a solid all-around kit, fails to measure up to more modern supports in the game, particularly in terms of mobility. These are some ideas I had to bring him up to par while preserving his uniqueness and simplicity.

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Passive: Gemcraft.

Taric's damage-dealing spells apply a stack of Shards on their targets. The debuff then begins to decay over 5 seconds. At the end of this duration, the Shards deal magic damage equal to 5% of Taric's AP per stack. Every time a new stack is applied, the 5-second decay is refreshed. The stack limit is 20.

Q: Imbue.

This spell becomes a circular AoE centred on Taric, 400 units in diametre. Taric and allied champions within 100 units are healed for 100% of the amount. Allied champions further away receive reduced healing (up to 20% the amount, for those furthest away).

W: Shattering Charge.

Passive: Taric reinforces his armour with gems and gains 10/15/20/25/30 bonus armour.

Active: This spell is a 500 units long skillshot dash. The dash ought to be fairly slow, so that the end-point should be easily predictable. All enemy units in its path will be damaged, debuffed and knocked aside (the same way Vi's ultimate moves units away from Vi's path to her target). The values of the magic damage and armour debuff inflicted remain as-is. This spell applies 2 stacks of Shards instead of 1.

E: Dazzle.

This ability becomes a 625-units-long, 50-units-wide skillshot that damages and stuns the first unit it hits. Damage remains the same (including the decreased damage with distance), but stun duration is increased to 1.6/1.7/1.8/1.9/2 seconds.

R: Diamond Pillar

Taric creates a pillar of diamond around target allied champion. This pillar grants the target 15/25/35 AD and AP, and absorbs damage the way Braum's shield does (but from all directions) until it shatters upon reaching its absorption limit or after 8 seconds. Absorbed damage equals 400/600/800 + 100% of Taric's AP. Upon shattering, the diamond pillar deals 50/100/150 + 20% of Taric's AP as magic damage to all enemies within 400 units of the target allied champion. The AD and AP bonuses end when the shield shatters. This spell applies 5 stacks of Shards instead of 1.

Cost: 100 mana. Cooldown: 120/100/80 seconds.

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Feedback is most welcome!