The Lee Sin of supports. Every decent support holds Thresh near and dear to their hearts. Easily the most rewarding support to play once you've mastered him. I have nearly 300 games on Thresh with a decent winrate and am constantly trying to improve my game on him. This is a fairly simple build for Thresh using the Relic Shield build path.

Flash and Exhaust will be the most common summoner's spells you take on Thresh, but you can also take ignite in the place of exhaust if you plan on going for kills in lane. This will generally be the case if you are against a squishy support with no escape or a low peel support that you can jump on the enemy ADC against.

I Generally tend to run

9x Attack Damage Marks

9x Flat HP Seals

9x Magic Resist Glyphs

3x Armor Quints

As these are the most beneficial to an aggressive Thresh. However, if you find yourself going against a harder poke lane and need the extra tankiness, or prefer to dive into teamfights, than it can be beneficial to swap out the AD marks for Armor.

For Masteries I run a typical 0/9/21 set up, but if you feel like you need more tankiness you can go 0/16/14.

I take a point in Flay level 1. With flay you have your passive to help with relic shield executions and also have bonus damage for harassing level 1. A simple auto flay auto will chunk the enemy down to nearly half HP at level 1. Then I take points in Q and W at levels 2 and 3 respectively. Take another point in flay at level 4 for the extra damage in lane, and then max Q. After Q you can either max W for stronger shields, or E for more damage.

Generally you want to be able to peel for your carries with support items such as Mikael's Crucible, while still being able to be a tanky initiator. The key is finding a strong balance and determining what your team needs most.

Thresh is one of the most rewarding champions in the game once you master him, he is essential to the support role and will likely never go out of style. Do yourself a favor and pick him up.

Thank you for reading my Thresh guide, it is my first guide and I'm not too familiar with formatting and such. I will hopefully be updating this guide in the future and improving formatting as I learn.