can surprise allies and enemies with unexpected combos with a clever use of his skills now we'll see some oh them and if you know some more i invite you to share it in comments :)
Gank/Engage combo: Hook the target with
and dash to him while trowing Dark Passage
on your ally. you know once somebody clicks the lantern he'll dash to you no matter the place you are so you may surpass Dark Passage
's range and still your ally would arrive ( i don't know if this stuff works with teleport as well as teleport isn't that good spell on thresh but if somebody wanna try...)
Rescuing combo: Hook a minion or a jungle monster and land
near a ganked/chased ally, start dashing when you see he used the lantern. if you didn't use this combo over walls ( Dark Passage
allows to pass up to 2 walls and Death Sentence
another one in places like blue champ) you might need to go for The Box
and then wait for the slow to finish and slow them again with Flay
(of course you must knock them away from you). also don't underrate the shield Dark Passage provides, addictionally to up to 180 it will gain 40% of your AP. a good soul farm and purchasing deathfire grasp if you're having a good time can give a huge shield (with death fire and 5 ranks Dark Passage
the shield will be 228)
Unfortunately i'm not skilled enough to post a map in which i circled the key points for what i'm going to tell you so i'll just give you a detailed description of the place you must act in. in mid lane you can reach wolves champ from a path that also brings to blue champ, so there's a sort of square from which three paths start. If you place
in the middle of that square while running away or during a team fight you'll split the battleifeld in 4 parts: mid lane, wolves path, blue and river path and the square itself. this will trap enemies into their side and will help you to get squishy targets. i'm not saying nobody will dare to cross your walls but they'll be forced to do it so you'll get a huge advantage against the carry and all squishy targets. this also helps you to run form a lost teamfight preventing enemies to reach you and/or your teammates.
around enemy Akali
's Twilight Shroud
to trap her.
is ulting near you you can place the angle of The Box
in the teleporting point so that he'll probably take 2 walls damages and won't be able to kill his target.
Another thing you can do in this case is to wait for something like 0.5 seconds and then cast
to the point he's teleporting into. if you placed yourself at the right distance you'll hook him allowing your teammates to get the kill.