http://pastebin.com/YaJpVLSh (log from Alice, Vincent crashes at the same point) Other Forge-based packs have worked fine with similar Java options through MultiMC. Running Windows 10 Pro (build 14393.693) with Java 8u121 (1.8.0_121-b13).
@uberifix thought that it might have been Nvidia when I asked on Discord, and that appears to be the case. Rolling back to 376.33 (2016-12-13) from 378.49 (2017-01-23) fixed it. Alternatively, LWJGL 2.9.1 seems to work fine on the latest driver, if someone can't roll back their driver and can figure out how to adjust the pack's LWJGL version.