When I get to the actual boss fight with the Tongue of Valmar (second boss of the game, at the town with the Skyway), as soon as it starts up after the "big reveal" cutscene, the game instantly crashes to desktop.

I've tried it twice now and the crash occurs identically. Any way to get past this?

(On version 1.07)

Specs:
Windows 7 x64
Radeon R9 290 w/Crimson 16.5.3
Fullscreen resolution: 2560*1440
Keep Aspect Ratio: Yes
Vsync: No
Fullscreen: Yes
60 FPS Battles: Yes