[Champion Concept] Aniroth - The Soul Reaper
[LORE]
After his trip to the Shadow Isles, Aniroth was cursed with powers that could kill anyone around him. Such powers destroyed the souls of those who came close and slowly killed them. And so, he fled. He traveled far to protect all people, however a thirst for souls overrun him. Years after years, he felt pain. He couldn't do anything but return and harvest souls for his own protection. Each man or woman he killed was consumed and gave him more power gradually. Slowly, he drifted away from the path that once held him. Now, he only seeks to kill in order to gain power.
Aniroth is a tank with AP scaling. His abilities are used to drive the enemy away from him, as he deals low damage and regains health.
[STATS]
Health: 612 (+81 per level) Health Regen: 6.68 (+0.12 per level) Mana: 348 (+49 per level) Attack Damage: 41 (+3 per level) Attack Speed: 0.6 Armor: 30 (+2.7 per level) Magic Resist: 21 Movement Speed: 330
[ABILITIES]
[PASSIVE] Harvester Whenever Aniroth kills an enemy champion, he harvests their soul, gaining Health and some Armor for the next 5 seconds. The enemy champion that was killed by Aniroth gains a stack of "Weakened Soul". "Weakened Soul" decreases the targets damage towards Aniroth by 0.5% and increases the damage dealt to them by Aniroth's abilities and basic attacks by 0.8%, stacking up to 5.
[Q] Blighted Earth Aniroth stabs his sword to the ground, creating a small blighted area for 4 seconds that continuously deals Magic Damage up to 35 Magic Damage in total. Enemies that are in the area also lose 8% of their current Magic Resistance. Damage: 35/50/70/95/110 Cost: 45/85/100/125/130 Mana Cooldown: 11/9/8/7.4/7 seconds
[W] Remnant Aniroth targets an enemy champion, and after a very short delay, pulls out their soul. Their soul remains onto the field and the enemy is unable to interact with it for 1.2 seconds. While the enemy's soul is on the field, it will continuously deal 12 Magic Damage and slow the target. The slow is increased based on how far away the target is. After the enemy exits the ability's range, the soul becomes unstable and goes back into the enemy champion, dealing 40 Magic Damage and 15 True Damage. The soul can be also obtained if the enemy champion walks over it after the delay. If it is obtained like that, the enemy champion takes no damage afterwards. Damage: 12/24/35/40/54 Secondary Damage: 40/50/75/80/95 Cost: 70/110/135/150/175 Mana Cooldown: 18/17/16/15/14.4 seconds
[E] Soul Drain Aniroth drains the power of nearby enemies in a circle, dealing 45 Magic Damage and increasing his Magic resistance by 5%, based on how many enemy champions the ability hit, and healing him. If the ability hits an enemy champion who has 5 stacks of "Weakened Soul", then they are dealt 15 extra Magic Damage and Aniroth gains a shield. If a champion doesn't have 5 stacks of "Weakened Soul", then he will take extra damage based on the number of stacks. Damage: 45/65/80/100/120 Cost: 55/75/100/125/140 Mana Cooldown: 20/18.9/17/16.2/15 seconds
[R] Hollow Aniroth targets an enemy champion. After a short delay, he places his hand onto the ground and a beam shoots up from the targeted champion. The ability lasts 8 seconds. During that time, the enemy champion loses 40% of his current resistances and deals 10% less damage. In addition, while the enemy is hollowed, they can't receive any healing from allied champions or get rid of crowd control effects. If the enemy champion has 5 stacks of "Weakened Soul", then they also take 20 Magic Damage over time and their resistances are lowered by an extra 10%. Damage: 20/25/35 Cost: 300 Mana Cooldown: 138/134/132 seconds
[APPEARANCE]
Aniroth wears heavy armor that has dark green crystals on his shoulders. His chest-plate, leggings and bracers are mostly black, but they have a coloration of dark green that is almost visible. He wields a big sword that has emits an aura similar to that of the Shadow Isles. His sword is made out of iron with dark green crystals on its grip and fuller. Aniroh is quite a large person, similar to Garen and has white long hair.
[STRATEGY]
"Remnant" Aniroth is a tank that can easily disrupt the enemy from farming. That is where his "Remnant" comes in. It is useful in lane, as the enemy will need to either obtain his soul by walking over it or by exiting the ability's range, thus losing minion kills. For him, both ways have their flaws. By walking over it means that he will have to enter your territory. If you cast "Remnant" and patrol the area around the enemy's soul, then he is in for a bit of a risk. On the other hand, if he retreats, he will lose a small portion of his health, putting him in danger.
"Harvester" and "Soul Drain" You should focus on killing, either with help or alone, enemies that have a few stacks of "Weakened Soul". Getting them to 5 stacks means you can gain a shield from "Soul Drain" and also deal extra damage to them. In addition, enemies that are stronger will require some help for you to apply "Weakened Soul". However, make sure you take the kill. Reaching each enemy to full stacks is what you want.
"Hollow" "Hollow" is not an ability you use to escape or to deal high damage. Whenever there is a teamfight, it is better to save "Hollow" for an enemy that is harder to kill (for instance a tank). If there is no need to cast it for the reason above, then casting it on an enemy that has 5 stacks of "Weakened Soul" can assure a kill.
"Blighted Earth" This ability doesn't deal a lot of damage, however it is a good way of reducing the enemy's resistance. At full point, it can prove useful as it will work along with "Soul Drain", by lowering the enemies resistance and dealing more damage with "Soul Drain".
[SYNERGY]
Aniroth works well with:
AZIR

Azir's ultimate can prove to be very useful. By being cast after you use "Remnant", the enemy will not be able to get close enough, resulting in him retreating, thus rendering his soul unstable. In addition, Azir's sand soldiers can poke from a distance and can keep the enemy away from their soul and once again, have them retreat and take the damage.
VARUS

Varus is an excellent choice who gets along with Aniroth. "Chain of Corruption" can be used to root enemy champions, so Aniroth can use all of his abilities to deal enough damage for the enemy to die or retreat. In addition, rooting the enemy champion can guarantee that your "Remnant" will deal further damage before the enemy champion cancels it. Through the rest of his abilities, Varus can deal lots of damage while Aniroth has them under control.
LEBLANC

LeBlanc's high burst of damage can be very effective while the enemy's defenses has been lowered. Whenever Aniroth uses "Hollow", LeBlanc can use her abilities to deal high damage while the enemy's champions resistances are down. In addition, Aniroth's "Soul Drain" functions in the same way, giving the chance to LeBlance to deal enough damage to secure a kill
Aniroth struggles against:
TRYDAMERE

Trydamere can deal easy damage through his passive and rendering you weak, making you retreat. In addition, his "Spinning Slash" can be a way of him escaping or dealing more damage towards you. Furthermore, lots of your abilities can be denied by his ultimate "Undying Rage", which will render him invulnerable, rendering "Hollow" useless at that time.
QUINN

As a ranged champion, she is able to poke you more than you are. In addition, her nearsight will reduce your vision, making you unable to use "Remnant" or "Hollow", as she or any other enemy champion will be not visible. In addition, she is able to escape easier than others and can make in harder for you to stack your passive.
MORGANA

Morgana can use "Dark Binding" to keep you away from her allies. In addition, most of your abilities, including "Hollow" and "Remnant", can be blocked by her "Black Shield". That way, it is very hard for you to cast most of your abilities on an enemy champion that is near Morgana.
[TRIVIA]
Ani is derived from Anima from Latin, which means soul.
Please let me know what you think of this concept in the comments. It is great to know what other people think and how something can be improved. I know for a fact that the lore can be improved a lot as I don't really know lots of things about the "League of Legends" lore.
This is the first time I suggest a champion in "League of Legends" and I hope I get some feedback from the community!