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The 0x119 is in many case caused by the GPU drivers or the GPU itself, also this time. As this is the first BSOD you've had there is a great chance that Windows has resolved the issue whilst rebooting, if this problem continues I would ask that you play other games too and see if the same problem occurs. If no problem occurs with other games then there are 2 options left
1. A bug in the game
2. The drivers aren't optimized for the game.
For option 1 you need to report the issue to the company of Overwatch, for option 2 either ASUS provides driver updates or you're unfortunate and cannot play the game without issues.
If the problem continues also with other games than there are other possibilities (including the drivers), but we'll meet them later if necessary.
Please fill in your system specs
0: kd> lmvm igdkmd64
Browse full module list
start end module name
fffff801`003c0000 fffff801`009fd000 igdkmd64 T (no symbols)
Loaded symbol image file: igdkmd64.sys
Image path: \SystemRoot\system32\DRIVERS\igdkmd64.sys
Image name: igdkmd64.sys
Browse all global symbols functions data
Timestamp: Sat Jul 18 02:27:57 2015 (55A99D8D)
Translations: 0000.04b0 0000.04e4 0409.04b0 0409.04e4
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