Senna vs Thresh

Attack the souls held by the Mist whenever you can: each soul freed with Absolution (passive) increases your AD, attack range and crit chance.

Fire Piercing Darkness (Q) through an ally or an enemy to hit both: the beam heals your allies, and damages and slows enemies in the line.

Cast Last Embrace (W) on a target that's already slowed or immobilized: after a short delay, they and nearby enemies are rooted.

Cast Curse of the Black Mist (E) to engage or escape with your team: allies who enter it are camouflaged, then fast and unselectable.

Cast Dawning Shadow (R) to save an ally across the map: the beam has unlimited range and shields allies.

Keep minions between you and Thresh: Death Sentence (Q) stuns and pulls the first unit hit, so one minion is enough to block it.

Step up when Death Sentence (Q) misses you: he keeps its full cooldown, 19 to 9 seconds, which only goes down if the hook lands.

Don't stay in his range for no reason: Flay (E) charges his autos between hits, and a charged auto hits hard early on.

Avoid being the first to break a wall of The Box (R): that one slows and deals full damage. After that, the remaining walls deal no damage.