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Smart Casting Nashors Tooth will instantly crash the game.
Reproduce: Any Champion (I think, was playing Orianna when it happened)
1. Start Custom Game (With Bots?)
2. Farm up to Nashors Tooth
3. Use Nashors Tooth with a SmartCast Hotkey.
I have tried using different hotkeys and they all seem to crash the game when smartcasting Nashors Tooth, I doubt champion would matter. This was on a custom game with Bots if it makes a difference, on Summoners Rift.