How in the hell does one fight against Gnar?

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Kill him stupidly fast, get full demons, a Kassadin, or Hush on someone who attacks really quickly.

Gnar is an instawin if he ults and any of his surviving team has any damage at all. The only way to beat him is to either murder his entire team before he ults, or kill him before he ults.

You could try spacing your units out farther. I believe he jumps to the furthest one, so if you can get an Ashe with a Rapidfire and stick her in the far corner, that'd also probably work.

To add onto this, you could try living the Hextech dream if they're item stacking on Gnar as well. Anyone you can stick in a corner, keep fairly safe but not bunched up with RFC/Hush/BT should be able to do the trick if you can position well and wipe everyone else fairly quickly.

Demons are a sketchy way to go given their instability late game (I don't know if that changed since last update) but an option nonetheless. All I know with them is you really need Swain, if you don't get a Swain fairly early that might not be a good way to go.

im particularly evil and I make gnar a sorcerer so he gets his ult faster and i put a morrelo or deathcap on him