Thresh is primarily a support but excels at disrupting the enemy carry's farm by spamming Death Sentence followed by Flay.
You must perfect the timing of Dark Passage to save your allies. They can get shielded during fights and/or escape if needed.
You can help your team most by focussing your Thresh build on armor and magic resist. Thresh will often be the first to engage the enemy team during a teamfight. You will often be targetted; get enough tank to survive.
LoL Thresh players could find him to be a challenging champion to build out properly. You'll notice that his build changes when he is up against either well-rounded or homogenous team compositions, meaning you should not choose the same Thresh build every single round of League of Legends
The most important items to include in your champ's build are: Locket of the Iron Solari, Redemption, and Knight's Vow. Those who included these pieces in their builds had a significantly better winrate than players who worked towards other builds for Thresh. Likewise, if you are facing a well-mixed enemy team arrangement, you should really consider grabbing him the Resolve, and Inspiration runes. In recent matches, he won the greatest number of his games when built with these runes.
We calculated our Thresh build guidance by analyzing 78,864 recently ranked League of Legends games with him selected. We only propose the highest winrate Thresh builds that have been used by ranked LoL players enough times for us to propose them. With so many rounds in our data, we are quite confident in our provided builds.