Welcome to the threshing floor. My name is Crank, and I'm a support main with 260k mastery on Thresh. I started playing near the beginning of season 4 following Yasuo's release. Thresh is widely considered to be the most versatile support in the game, with a high skill floor and an even higher skill ceiling. The dictionary definition of a playmaker, Thresh is a champion defined by his flashy kit and ability to make the plays that directly influence the outcome of the game. He is capable of both highly aggressive and strongly defensive play, and is rarely a bad pick in any team composition. This guide serves as both a beginner's introduction and an advanced mechanics guide. You will find pieces of wisdom here from some of the best professional support players, as well as insights from my personal experience.
Thresh's primary runes are very straightforward, but your marks demand special attention.
Thresh's role as an initiator and bodyguard demands a tankier build that emphasizes strong early game stats. Armor quints give him the armor he needs in the early game to outlast his opponents and win trades.
Thresh's marks are the most important part of the rune page, and which ones you choose should depend on what item you will start the game with. Because Thresh's auto attacks are classified as ranged, procing relic shield's execute is extremely difficult without extra attack damage from runes and his Flay's passive. If you intend to start with relic shield, use 9 attack damage marks. Your adc will thank you.
Flat MR glyphs are your best choice on Thresh in almost all circumstances, especially when you don't know who your lane opponents are. There are two other specific circumstances where different glyphs may be better:
Take these when the enemy team has one or more AP champions on their team, but no AP in their bot lane. Scaling glyphs outperform their flat counterparts starting at level 9, so unless you expect frequent ganks from their AP jungler or mid, scaling MR glyphs will benefit you more after level 9.
These can be good on Thresh if he has absolutely no need for magic resist. Against all AD teams, CDR glyphs perform well. The choice between flat and scaling is a matter of how much pressure you want to exert on your lane opponents in the early game, and how well you can manage your mana pool.
Flat health seals compliment the armor quints and MR glyphs nicely, and give you more weight to throw around in the early game. Scaling health seals can be considered if you want to play a passive lane, or you think your lane opponents will be difficult to all-in.
Flash is an indisputable and mandatory summoner spell to take on Thresh. Aggressive playmaking relies on flash to close gaps and reposition. A confident Thresh player will learn to use flash seamlessly with their kit to make plays and catch opponents off guard. Mastering flash flays and flash hooks is essential to becoming an accomplished Thresh player.
Exhaust is my second go-to summoner spell on Thresh because of its versatility. Exhaust is useful when winning lane and when losing lane. It is useful in early game and late game. It shuts down enemy carries and peels for your adc. It saves lives and secures kills. Exhaust never fails.