Champion I decided to expand upon after playing a game on the boards a while ago.
Karek The Mist Stalker
Lore - TBA but a rough idea I had was he that he ruthlessly hunts any living person who steps into the Shadow Isles.
Role - Marksman
Base Stats: Health - 563 (2091) Health Regen - 3.8 (13.7) Mana - 296 (943) Mana Regen - 7.0 (12.4) Range - 550 Attack Damage 58 (114) Attack Speed - 0.698 (+0 - 59%) Armor - 27 (75) Magic Resist - 30 (38) Movement Speed - 330
Passive: If Karek steps out of a bush or his Q, he remains invisible for one second before being revealed. In addition, every 4th auto attack applies a potent poison which lasts for 1.5 seconds that can stack twice if he has enough attack speed for it. Leaving stealth from a bush has a short cooldown between uses that starts after leaving bush. Poison Damage: 40/80/110 +30% AD Physical Damage every 0.5 seconds
Q: Karek fires a container of condensed mist that deals 30/45/60/75/90 +10% bAD physical damage at the impact zone before it explodes to cover a large area in mist, dealing double damage for enemies that are in the center. Enemies inside have their vision reduced, but are capable of seeing units inside it.
W: Karek lays a trap which quickly arms itself. It does no damage but if an enemy steps on it, said enemy is grounded and slowed by 40%. If the enemy fails to leave the zone, they're rooted for 1.5 seconds.
E: A buff that increases his attack speed by 20/30/40/50/60%, his range by 50, and both poisons by 10/15/20/25/30 as a flat amount 10% to the ad bonus for 6 seconds, but he loses out on 25% movement speed and 15% bAD during it.
R: Charges his weapon to fire bolts coated in a different poison that does 15/20/25 + 5% AD every 0.5 seconds for 5 seconds that stacks on top of his passive, slows for 20%, and lowers the enemy's armor by 25%
Hope it's not too bad of a design. First time actually coming up with a champion idea like this so I can't say how well it's balanced.