Tahm and Fiddle have next level synergy.
Two main points -
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When Tahm eats someone Fiddle is draining, Fiddle will keep draining them while they are in Tahm's belly, as tethers remain attached when a champion goes untargetable. He's worse than tape worms.
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When Fiddle ults, Tahm can swallow him and carry him around (with a 50% speed boost to boot) and crow storm will keep on dealing damage. Zhonya's? I got a guy for that.
There's also that fear that all but guarantee Tahm can auto+q+auto devour someone, but that's obvious.
This is like, the most fun you can have in bot lane. For you, of course. Tahm Kench + anyone is total BS to play against, and Fiddlesticks makes it all the worse.