What Does Tahm Kench Do Exactly?
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In the world of RuneTerra I mean (In the lore, not in-game). Hey is known as a Demon. Has powers to grant wishes, but will eventually return to devour (literally) everything you have come to cherish. But what actually happens?
https://www.youtube.com/watch?v=u9RM4HwwoKs
"Desperate times call for desperate measures. I can make you a fine bargain… but you gotta be willing to pay the price."
In this particular tale a Gambler had nothing to his name and was in a bind. Tahm Kench lured him in and made him a deal. Accepting the offer the Gambler was whisked away to a faraway land and "A palace of chance he was left".
Now the Gamblers story ends with him getting married years later. He has a manor to his name now which (spoilers) Tahm eats. Like literally eats house house? and the gifts, and the gold.
"A deal with Two-Coats may carry you to wherever you wish, but your journey will most assuredly end in the depths of despair."
**Wherever you wish. **
"Boy, the worlds one big river and I'm its king. Ain't no place I ain't been. Ain't no place I can't go again."
What exactly can Tahm do? He can go anywhere and give anything it seems, for a price. Here are a few interactions I find interesting.

- "Your strength is waning, General. 'Course, I can help you slow time's regress."
- "Time is just a river, boy, let me take you back where you belong."
- "Could I offer you a bargain to replace your previous engagement?"
- "A journey to a moonstone is one I could provide."
- "Do you want to reach your potential? It's a journey I could provide."
Just from these we can see just how powerful Tahm Kench can be. To slow the effects of aging, ferry passengers to any point in time, reverse the power of the Watchers, deliver you to the location of a single item and even become the master of your own potential.
Tahm Kench is just a facinating character. One precent wherever there are those that seek to make a deal. It seems that his own desires are to sate appetites for core emotions and desires.
- "Let me make a meal with your ambition."
- "The road to vengeance requires a journey I would happily provide."
- "It is wonderful to be hungry for a challenge."
- "A drive for** innovation**? It's just a hunger for something new."
- "Coveting friendship is barely an appetite - but one I do so sympathize with."
If you are determined to your cause, but begin to doubt whether you can reach your goals Tahm may lure you in with his song and words only to consume all you have worked for in the end. An end that may be years later.
UPDATE:
A lot of people say he feeds on emotion. We can all agree on this, yes? But he must have some supernatural powers to grant his "wishes" to some extent, right?
Take his interaction with Darius. "Your strength is waning, General. 'Course, I can help you slow time's regress."
Could he actually slow the aging process or even give him increased strength before he comes back and takes it away?
And with Nami: "A journey to a moonstone is one I could provide."
Tahm must be able to locate, or even summon, a powerful artifact such as a moonstone?
: what is he? a smart void-spawn is as in-depth as it got.
: what is he? Well a tad bit more effort was put on this guy. But we still have no clue if he is a living-breathing person or not. Nah that's just another "story hook" guys.
: what is he? Probably the most complex champ in-lore. Do we have any lore shedding light on some of those complexities? No, just a 3min animation. Ugh...