As tahmkench, Tahm Kench can absorb a lot of incoming damage in lane and in team fights with his E. If he activates it at the right time, he can have basically two health bars and be near impossible to kill.

His Ultimate r is very versatile. It can be used to save an ally, or catch somebody out of position. It is a great tool especially in mid and late game team fights 

His W is very versatile. It can be used to escape skirmishes, get over walls, look for plays and many other things.  As tahmkench, Tahm Kench can absorb a lot of incoming damage in the track and in team fighting with his E. If it activates it at the right time, it can basically have two health bars and be almost impossible to kill. Its Ultimate r is very versatile. It can be used to save an ally, or catch someone out of position. It is an excellent tool especially in the middle and the end of the game team fights His W is very versatile. It can be used to escape the skirmishes, get over the walls, look for parts and many other things.