Passive: Damnation Innate: Thresh does not gain armor per level. Instead, Thresh collects the souls of dead enemies by walking near. Souls permanently grant .75 armor and ability power. Champions and large minions always drop a harvest-able soul. Small minions only sometimes drop a soul.

A soul will only drop if the enemy unit dies within 1900 range of Thresh. Souls are visible to allies, and only become visible to enemies if the enemy team has vision of Thresh.

How do we use this ability?

Thresh's passive is incredibly useful as it allows him infinite scaling (The number of souls caps at 999,999, at which point Thresh will have 749,999 bonus armor and ability power.) for both ability power and armor. To collect a soul simply walk over it or throw Dark Passage on it. Souls are important to thresh, however I advise not taking harass in lane over 1 soul. Sometimes you will need to leave a soul so you can remain level in lane.

Interesting fact

"On Summoner's Rift, the drop rate for souls from small minions is 33%. However, the probability adjusts dynamically. If you are above or below your expected quota of soul drops from small minions, the probability lowers or rises by a small amount until you are back at your quota of drops. It is worth stressing that this only takes into account souls dropped, and not souls collected." - http://leagueoflegends.wikia.com/wiki/Thresh

Q: Death Sentence: ACTIVE: After a 0.5 second wind-up, Thresh throws out his scythe in a line and forms a tether with the first enemy hit, dealing magic damage and stunning it for 1.5 seconds. Upon hitting an enemy, Death Sentence's current cool down is reduced by 3 seconds.
While the tether persists, Thresh cannot attack and he will periodically tug on the tether, each time pulling the target a short distance toward himself. After 0.5 seconds, or instantly if he hooks a minion or monster, Thresh can reactivate the ability to use Death Leap.

ACTIVE - DEATH LEAP: Thresh pulls himself to the bound enemy. This removes the stun but allows Thresh to attack again. Thresh loses the ability to activate Death Leap when the tether breaks.

RANGE: 1100 COOLDOWN: 20 / 18 / 16 / 14 / 12 COST: 80 MANA MAGIC DAMAGE: 80 / 120 / 160 / 200 / 240 (+50% AP)

How do we use this ability?

Death Sentence or hook is a single line skill shot. What you want to do with the hook in the lane is flay the enemy first. This slows then and if you flayed them towards you gives less travel distance for the hook. Once they have been flayed it should be a lot easier to hit Death Sentence. Once you have an understanding of the cast time and travel time of death sentence you can then attempt and successfully land long range hooks.

In teamfights there are 2 ways to play thresh. One way is as the initiator. I am not a big fan of this, but if your team lacks an initiator you need to hook an enemy champ, preferably a carry or squishy. Once you land the hook press Q again to activate death leap. Once you land in the middle of the enemy team quickly Flay and then use The Box, throwing out Dark Passage to your team for them to come in.

The second way to play Thresh is as an actual support. This is way I recommend playing thresh when you can. Thresh offers incredible peel. All his abilities are great at keeping the enemy off your carries. What you need to do is position yourself infront of your carry. When the enemy assassin or bruiser comes in to kill your carry you need to be in their way. Flay the enemy back and hook them. If multiple enemies jump onto your carry Flay them off and use The Box, have your carry run out the back of the box while you run the opposite direction (most likely towards your frontline which is most likely killing the enemy backline) throw them a lantern and have them re-position back with the team. This is the ideal situation if they are jumped on by multiple enemies.

W: Dark Passage: Thresh throws his lantern to the target location where it remains for up to 6 seconds. If an ally right-clicks the lantern, they will pick it up and will be pulled to Thresh's location. If Thresh moves more than ~1500 units away, the lantern will return to him.
For the next 6 seconds, allies who come near the lantern (even while Thresh is holding it) gain a shield that absorbs damage for up to 4 seconds. Allies can only receive the shield once per cast.
RANGE: 950 COOLDOWN: 22 / 20.5 / 19 / 17.5 / 16 COST: 50 / 55 / 60 / 65 / 70 MANA SHIELD AMOUNT: 60 / 100 / 140 / 180 / 220 (+40% AP)

How do we use this ability?

Dark Passage is pretty simple to use. Throw it very slightly in front of where your team mate is running to and begin walking. In team fights lantern can be used to re-position a player or just to shield someone. Threshes lantern is similar to a temporary ward. It reaveals fog of war and allies can use abilities such

E: Flay: PASSIVE: Thresh's basic attacks deal bonus magic damage on each hit. This value is equal to the total number of souls collected, plus a percentage of his attack damage based on the amount of time since his last attack.
BONUS MAGIC DAMAGE: Souls + up to 80 / 110 / 140 / 170 / 200% AD

ACTIVE: Thresh sweeps his chain in a broad line towards a target direction. Enemies hit take magic damage, are knocked in the same direction as the chains, and are slowed afterwards for 1.5 seconds.
ACTIVE MAGIC DAMAGE: 65 / 95 / 125 / 155 / 185 (+40% AP)
SLOW AMOUNT: 20 / 25 / 30 / 35 / 40%

How do we use this ability?

Flay is an incredibly strong ability. Flay's active is a point-blank, line area of effect. The direction of knockback is determined by the direction of the line. It also passively grants Thresh an on-hit effect. When his on hit effects are fully charged his hook glows green, and the buff icon becomes red. Try to poke the enemy down with this on hit effect, and then flay into a hook for the kill.

R: The Box: ACTIVE: After a 0.75 second delay, Thresh summons 5 spectral walls around him that last up to 5 seconds. Enemy champions that touch a wall take magic damage and are slowed by 99% for 2 seconds, but break the wall. Once one wall is broken, the remaining walls deal half damage and apply half the slow duration. An enemy can be affected by multiple walls.
RANGE: 450COOLDOWN: 150 / 140 / 130COST: 100 MANA
MAGIC DAMAGE: 250 / 400 / 550 (+100% AP) REMAINING WALLS DAMAGE: 125 / 200 / 275 (+50% AP)

How do we use this ability?

The box can be used in multiple ways. It can be used to box your carries preemptively, can be used to escape chasing enemies and can be used to lock the enemy down if you can land a death sentence.