Vaastare, The Darkin Storm
As Darkin is the archetype of demonic champions (Aatrox), I have added a Mage/Tank there!. He is a some kind of rip off of WoW Warlocks, but I don't see anything wrong about it.
This is the kit as its structure (WIth no numbers);
Vaastare, The Darkin Storm Melee I- Firesoul Vaastare gains 0.25/0.5/0.75% bonus AP for each 1% missing health. After dying, Vaastare deals medium(+100%AP including I bonus at 0HP) to all champions in a large area. Q - Ignite (Long Range - Medium-to-low Cooldown Vaastare marks target area. After a short delay, the area fires dealing medium damage on impact. After that, the area will ignite all enemies that cross the area damaging them for low amount over time. W - Unending Resolve (Self - Medium cooldown) p; Vaastare gains bonus low armor and magic resist a; Vaastare hardens his skin, gaining bonus armor ,magic resist and shield for a short time. The gains are based on the level of W and missing health E - Suffering (Medium - Long-to-low cooldown) Vaastare links to target champion for some seconds. Vaastare autoattacks deals low increasing bonus damage to target champion. After the duration of Suffering, the target is Feared for some seconds R - Metamorphosis (Ultimate) Vaastare energizes itseld with Shadow powers, gaining an aura whicl deals moderate(between low and medium) damage each second and a high health regeneration for a medium time. Vaastare can reactiavate R to make Demonic Leap. R2 - Demonic Leap (One use) Vaastare jumps to target area, dealing low damage and stunning champions for some seconds. They are slowed after that.
He (Or she?) is intended to go Top or Supp. He pushes/pokes with Q, disengages/engages with E and survives ganks thanks to W. During teamfights, he tryes to engage with ult on enemy valuable target or peels for the valuable target of your team.
Now with numbers (Don't take seriusly);
Vaastare, The Darkin Storm Ranged I- Firesoul Vaastare gains 0.25/0.5/0.75% bonus AP for each 1% missing health. After dying, Vaastare deals 42(+11 per level)(+100% AP) to all champions in 450 Radius.
- AP bonus affects to champions dealt by Firesoul and the ashes of Ignite while dead Q - Ignite (1050 Range(175 Radius)/0.5 sec delay - 16/14/12/10/8 sec CD - 80/90/100/110/120 Mana) Vaastare marks target area. After a short delay, the area fires dealing 70/120/170/220/270(+ 45%AP) on impact. After that, the area will ignite for 4 sec. damaging all enemies that cross the area for 15/27.5/50/62.5/75(+15% AP) for 3 sec. W - Unending Resolve (Self - 16/15/14/13/12 sec cooldown - 60 Mana) p; Vaastare gains bonus 10/15/20/25/30 armor and magic resist a; Vaastare hardens his skin, doubling the passive bonus of Unending Resolve and gaining 60/100/140/180/220 shield. The shield bonus is increased 0.5% for each 1% of missing health. E - Suffering (650 Range- 9 sec cooldown - 45/55/65/75/85 Mana) Vaastare links to target champion for 3. Vaastare autoattacks deals 30/40/50/60/70(+10%AP) bonus damage to linked champion. After the duration of Suffering, the target is Feared for 1.75 sec. R - Metamorphosis (Self Cast - 160/120/80 sec CD - 100 Mana) Vaastare energizes itseld with Shadow powers, gaining an aura which deals 30/55/80(+20% AP) damage each second and a 40/60/80 per 5 Health Regen per second for 8/9/10 seconds. Vaastare can reactiavate R to make Demonic Leap. R2 - Demonic Leap (800 Range - NO CD - 0 Mana) Vaastare jumps to target area, dealing 100/175/250(+100%AD) and stunning champions for 1/1.25/1.5 seconds. They are slowed by 40% for 2 sec after the stun.