[Champ concept] Aggos, the Prismatic Sorcerer

Aggos is a mage intended for the midlane. He wears a light blue robe and he has no staff or weapon, instead prismatic crystals circle around him most of the time, like Syndra's balls.

Not providing any stats, but he's supposed to have pretty normal mage stats. xD Auto attack range is 550. Also, his auto attacks travel pretty fast, like an adc. Lots of reading is required to understand this concept.

Passive - Prismatic Preperation

After standing still and not using an ability for 6 seconds, Aggos starts meditating. While meditating, he restores 10 Mana + 6% missing Mana every second.

Q - Prism Enchantment

Cost: 30 / 35 / 40 / 45 / 50 Mana CD: 2 Seconds after channeling

Passive: Aggos gains 10% (+ 10% per 100 AP) attack speed. If he has prisms and uses a basic attack on a minion, champion or monster, he fires one of his prisms instead of his standard magical bolt.

Aggos' prism basic attacks deal 20 / 30 / 40 / 50 / 60 (+ 20% AP) extra magic damage at prism stage 1, 30 / 45 / 60 / 75 / 90 (+ 35% AP) extra magic damage at prism stage 2 and 50 / 80 / 100 / 120 / 140 (+ 50% AP) extra magic damage at prism stage 3.

Active: Channels for 0.75 seconds to create 3 prisms. He can have up to 6 prisms. When using this ability while Aggos has at least 1 prism, all his prisms are powered up by 1 stage, which changes their color. (3 is the highest possible stage, stage 1 is green, stage 2 is yellow, stage 3 is red). If Aggos has no prisms when using the ability, his prisms start out at stage 1. After 6 seconds of not auto attacking or using this ability, Aggos' prisms go down to stage 1.

W - Crystal Shield

Cost: 50 / 60 / 70 / 80 / 90 Mana and 1 prism CD: 12 / 11 / 10 / 9 / 8 Seconds Shield: 50 / 70 / 80 / 90 / 100 (+ 30% AP) Duration: 2 seconds with a stage 1 prism, 4 seconds with a stage 2 prism and 6 seconds with a stage 3 prism.

Aggos uses a prism to create a crystal around himself that shields him. Higher prism stage means longer shield duration.

E - Magical Blast

Cost: 60 / 75 / 90 / 105 / 120 Mana CD: 10 / 9 / 8 / 7 / 6 Range: 1000

Shoots a large sphere of energy in a straight line that explodes on the first enemy champion hit, dealing 50 / 70 / 90 / 110 / 130 (+ 40% AP) magic damage and applies a magical mark to the enemy for 4 seconds. Aggos' next basic attack on the marked target consumes the mark and stuns the enemy for 0.8 / 0.9 / 1.0 / 1.1 / 1.2 seconds.

R - Crystal explosion

Cost: 100 / 125 / 150 Mana CD: 160 / 145 / 130 Seconds Explosion radius: 600

Aggos explodes, dealing 250 / 300 / 350 (+ 75% AP) magical damage in an area around him. He then takes form of a magical cloud that nobody can interact with, for 3 / 4 / 5 seconds. In this form, Aggos can not take damage and he can not attack, cast spells or use items, but he can move around. After the effect is over, he transforms back to his normal body.

So yes, that's my champ concept. His gameplay should be like that of a battle mage and he uses auto attacks for his damage. Recommended items are RoA and Nashors Tooth. The mechanic of his Q should be really interesting, because he has to charge it up all the time. He has to time his casts well to get a good amount of prisms and then throw them on the enemy. An important strategy is to stop attacking if you have only 1 prism left so you don't reset the prism stage during a fight. His ult is a really powerful tool to deal damage and to provide safety, but the cooldown is high.

All in all I'm pretty happy. Let me know what you think. :)