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Hey There, im a mod dev, perhaps i could help you understand whats happening. Thank you for posting the entire crash report, so i can get some more details. However you should try to put them in pastebin so it doesnt look as messy. Anyways, in code there are these things called entity IDs that you would have for each mob. Your error is with the Orespawn mod, i have had this error before. As me and you both know, Orespawn adds ton of mobs which are really cool, however it crashes when you are using other mods that have entities because orespawn takes up all the slots. so you either gotta remove some of your mods that use entities, or the Orespawn mod

The only thing I can read out is your mods and your system. My only idea is that there were no more entity indicies left (i think when they say indicies they mean index). What I conclude is that there were no more mobs in the index but I'm probably wrong. What I suggest is putting it on https://www.minecraftforum.net/.

My game once crashed because I was messing around with the debug stick and it modified air. Crazy.