League Of Legends

Damnation is a passive ability that causes enemy units to leave their souls behind when they die near Thresh. Regular minions and monsters will sometimes leave a soul when they die. Enemy champions as well as large minions (siege minion or super minion) and large monsters will always leave a soul when they die. Thresh can pick up these souls by walking near them. Each soul gathered increases Thresh's armor and ability power.

The first soul will grant 1 bonus ability power and armor. Subsequent souls will grant 0.01 less, down to a minimum of 0.5 per stack. This will stack to 999999. [1]
The 0.5 minimum is reached at 51 stacks, granting 38.25 bonus stats.
The maximum amount of ability power and armor gained is 500,012.25.
This amount of armor, including his base of 18, grants 99.9998% damage reduction.
Even with the 35% armor penetration from Last Whisper, Thresh still benefits from 99.97% damage reduction.
Thresh surpasses 99% damage reduction at ~20,000 souls, rendering souls above this surplus with regards to armor.
It takes ~80-100 souls to catch up to the armor levels of other level 18 champions.
It takes 119 souls to catch up to the highest armor levels of other level 18 champions.
The spawn range is 2000 units.
The souls disappear after 20 seconds. PENDING FOR TEST
Souls are visible to your allies at all times. If an enemy can see you on soul spawn or at some point during the soul's existence, the soul becomes visible to the enemy team for the remainder of its existence.
On Summoner's Rift, the drop rate for souls from small minions is about 20%. PENDING FOR TEST
Souls are colored differently depending on the team Thresh is on.