PRO: Ranged 3 forms of CC Bringing alleys Able to escape and help alleys for escaping too High Armor and Ability Power by passive Helping jungler for ganking bot lane

CON: Must collect souls, otherwise weak in late game Long CD Hard to learn

21.78 ARMOR
As Support, the primary is the high armor.
12.06 MAGIC RESIST
Important.
11.52 ARMOR PENETRATION
In S4 armor penetration runes give you more damage then AD runes.

YOUR PRIMARY TASKS

• Protect your ADC
• Grant safety farming
• Get vision control
• Keep alive

YOUR SECONDARY TASKS

• Collect souls
• Harass enemy ADC
• Assist alleys' killing
• Help jungler for ganking your lane
• defend your turret

EARLY GAME LANING
Play safety until level 3, but attack if u have chance.
Harass enemy with basic attack, grab enemy adc with Death Sentence, and ony reactivate it if your adc is close, you have 80-80% or more HP and Heal.
After level 3 try to keep your mana upper then 260.
Continue harassing enemy whit your basic attack what is now stronger by Flay's passive.
Use Dark Passage for collecting soul if enemies are in better condition, or help your ADC moving and shielding. Use Flay for pushing away enemies, if they are too close.
If you and your ADC have better condition, get the first blood on bot lane:
Drop your lantern for your ADC, then grab enemy ADC with your Death Sentence. When your ADC activate the Dark Passage, activate the Death Sentence. Now you and your ADC are in enemy ADC. If it try to run, pull it back with Flay!

EARLY GAME GANK
When your jungler is on the bush, give him the Dark Passage and run over enemy, or use Death Sentence. Try to run over if its safety, because later you can grab the escaping enemy.

GANK COUNTERING
Run closer to your ADC, or use Dark Passage for the same destination (pick what is more logical in the situation). When the jungler try to jumping on you or to your ADC (that's why u want to go closer), use Flay in the last while to knock him up, and push away. If you currently under your turret, activate Death Sentence for trap him.

EARLY VISION CONTROL
The MOST important item is Sightstone. When you have 800 gold, recall and get it. If you must go back before getting 800 gold:

400 or more:

• Ruby Crystal
• 1 Vision Ward
• 1-3 Stealth Ward
  less then 400:
• 1 Vision Ward
• 1-3 Stealth Ward

FLEXIBLE LANEING
As support you have lot of times checking the map. Try go get enemy blue for your ADC, ping if enemy missing, or they going to get the dragon.
If you killed enemy on your lane:
get the enemy turret, or run up to mid lane. Try to supprise enemy mid laner with the Dark Passage + Death Sentence combo, then use The Box and/or Flay.
If all ot lane turret is standing and enemy ADC's bonus Attack damage is under 30 your primary item is Talisman of ascension. Otherwise Randuin's Omen.
TEAM FIGHT
If you have Randuin's Omen, you can tank team fights, if it's not done, try to fight by side of by using Death Sentence without reactivateing, Flaying when enemy damage dealer is attacking you, sileding alleys with Dark Passage and using the box, when enemys' focus is not on you.
FAILED TEAM FIGHT: ESCAPE
This is one of Thresh's speciality.
If only you and 1 alley left:
Drop Dark Passage, use Death Sentence on a jungle monster (across the wall), then reactivate Death Sentence while alley using Dark Passage.
If 2 or more alley left:
Dark Passage for the last one, Flay back close enemy and slow them with The Box.

PASSIVE: DAMNATION
Increasing your armor, the power of your abilities and your basic attack if you have Nashor's Tooth or Lich Bane.
Increase the effectiveness of Randuin's Omen's UNIQUE active.
CON: useless if you can't get souls.

Q: DEATH SENTENCE
Grab enemy champion or minion and pulling closer, meanwhile you can moveing but can't using ability expect item skills.
Pull can move target across small objects, like Anivia's wall, Jarvan IV's ulti, Trundle's pillar or terrain objects.
You can reactivate this skill, and pulling Thresh to the target.
That works across any objects.
Good for getting closer to enemy, silence and immobilize enemy for short duration or grabbing a jugle monster and escaping.
CON: can miss by wrong direction or minion. High CD on low levels.

W: DARK PASSAGE
Dropping a lantern (able to across any object). Grants shiled on the location where it landed. If an alley stand on it and reactivate it, pull it to Thresh (able to across any object). So, Dark Passage grants shiled for your team, and brutal mobility for your alleys. Able to save 1 of your alley or help catching up.
Can combinate with Death Sentence! Use Dark Passage, then grab the target with Death Sentence. While alley activate Dark Passage, activate Death Sentence!
Result: incredibly high distance in 1 sec!
CON: Can disable it if enemy standing on the lantern.

E: FLAY
Passive: charging, then increase your first basic attack based on your AP and charging time.
Active: knock up, damanging and moving in to the selected direction all enemy champion, minon and monsters, who is on the Flay's zone. Able to push or pull enemy. Flay is Thresh's only powerful ability (expect The Box). Enemy is disabled while knocked up. This skill is able to toss over or pull in enemies from/to Jarvan IV's ulti.
Combinating with Death Sentence disable enemy for some sec. Use Death Sentence, keep it until you can, then reactivate and Flay. If enemy dont have Flash and any moving skill, basic attack and then use Flay!
CON: Only works if enemy is closer. Worong direction can makes lot of problem.

ULTIMATE: THE BOX
Summon 5 wall around Thresh. If enemy touch the wall it's dissapear causing high damage and slows enemy. Alleys can move trought. Minions can't activate walls. Able to trap or execute enemy (if it has low hp). Use it if you must escape, The Box is perfect to gives you time for flee.
Use Flay for toss enemy across the wall, or Death Sentence if you are in out side.
CON: Dissapear after 2 sec. Useless if enemy doesn't touch the walls.

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ULTIMATE AND CHANNEL BREAK

Death Sentence and Flay can break lot of champions' skill, like these: Caitlyn - Ace in the Hole Fiddlesticks - Bountiful Harvest and Crowstorm Galio - Idol of Durand Janna - Monsoon Karthus - Requiem Katarina - Death Lotus Malzahar - Nether Grasp Master Yi - Meditate Miss Fortune - Bullet Time Nunu & Willump - Absolute Zero Pantheon - Heartseeker Strike Grand Skyfall Twisted Fate - Destiny Urgot - Hyper-Kinetic Position Reverser Warwick - Infinite Duress

When you stopped one of about these abilities, the target lose it, and he want to wait cooldown, until the next activate.

There is some op skill combo what wants good team work and necessary champion with the necessary ability.
Anivia makes a wall with Crystallize near by an enemy. Then you pull the target over the wall with Death Sentence.
DIFFICULITY: HARD Stand behind Blitzcrank. He use Rocket Grab, then Overdrive. After you use Death Sentence, then Flay. Overdrive again. If its not enought someone use him ultimate. This combo enought for totally disable and kill an isolated enemy.
DIFFICULITY: EASY In team fight. Run to middle, the throw a lantern to Janna. While she reactivated Dark Passage, activate The Box, then Janna Monsoon. Result: Brutal damage!
DIFFICULITY: EASY Orianna use Command: Protect on you, then you move her ball to the team fight by running or Death Sentence. Use Command: Shockwave and Command: Dissonance, then The Box.
DIFFICULITY: EASY By the way thresh works together nicely in team fight, with anyone who has ranged ultimate skill or simple ability. Like the following champions:
Anivia
Fiddlesticks
Galio
Gangplank
Heimerdinger ( UPGRADE!!! + H-28G Evolution Turret in The Box)
Katarina (she is in outside of The Box)
Miss Fortune (she is in outside of The Box)
Nunu & Willump
Vel'Koz (it is in outside of The Box)
Vladimir
Yasuo's ulti on knocked up enemies by Flay
Ziggs
Zilean's Time Bomb on Thresh, then Death Sentence
Zyra

DEFENSIVE ITEMS

High HP, and high ARMOR. passive: attacked by enemies is slowing them attack and movement. active: slows all nearby enemy based on your armor. Good combo with Damnation.

High HP and some ARMOR. passive: damage all nearby enemy. Good combo with Flay and The Box.

OFFENSIVE ITEMS

High ATK SPEED, some AP. passive: increase your basic attack with magic damage, based on your AP. Good combo with Damnation, and increase Flay's passive's power.

High MANA, some ARMOR, some AP and -10%CD. passive: after ability, first attack become field damage, what slows too. Increase effectiveness of Flay's passive.

Thresh can do top lane, mid lane, can be ad, ap, support and tank. If you want to create ADC THRESH, get an other guide, like this.
But now, i will show you, my favorite troll build:
THE GIFT DAMAGE DEALER.
This build bad against normal players! Use it while you are smurfing. This bulid only works good if you get all items. Until you dont own the full build keep off strong enemies, kill isolated champions and farm, farm, farm!!!

Let's see the items:

+65 fix MOVEMENT SPEED +15 MAGIC PENETRATION.

+60 ABILITY POWER +50% ATTACK SPEED +20% COOLDOWN REDUCTION +15 BONUS DAMAGE (+15% AP)

+70% ATTACK SPEED +50% ATTACK DAMAGE for 2 other nearby enemy (+10 p-dmg and all bonuses)

+40% ATTACK SPEED +20% CRITICAL CHANCE +6% MOVEMENT SPEED +100 BONUS DAMAGE for 4 enemies

+42% ATTACK SPEED +25 MAGIC RESIST +42 BONUS DAMAGE +5 MAGIC PENETRATION (stack up to 25)

+100 ATTACK DAMAGE (while stacked) +18 LIFE STEAL (while stacked)

SOOO... the result:

That means 754,4 TRUE DAMAGE IN 1 SEC!


That means 979,4 TRUE DAMAGE IN 1 SEC!
and 813,8 for the other 2 nearby (if they have 70 armor and mr too)
So finally it is 2607 shared TRUE damage in 1 sec...
...and a didn't count critical...

There is a video, how thresh is bads$! Play Video