I looked at the other 1.9.0 crash issues, but I do not believe I have any of the mods that caused similar crashes. It crashes when getting to the forge initilization part, and gives the error

net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from Minecraft Forge (forge)
Caused by: java.lang.ClassCastException

Just before the crash, it has these errors

[13:27:12] [main/ERROR] [FML]: Exception caught during firing event hellfirepvp.astralsorcery.common.event.ItemEnchantmentTooltipEvent@61386d46:
java.lang.ClassCastException: null
[13:27:12] [main/ERROR] [FML]: Index: 1 Listeners:
[13:27:12] [main/ERROR] [FML]: 0: NORMAL
[13:27:12] [main/ERROR] [FML]: 1: ASM: hellfirepvp.astralsorcery.common.event.listener.EventHandlerMisc@ddcb1de onEnchTooltip(Lhellfirepvp/astralsorcery/common/event/ItemEnchantmentTooltipEvent;)V

FTB Revelation 1.8.0 (with additional mods and updated forge updated to 14.23.4.2704)

Full Log: https://gist.githubusercontent.com/MrFastZombie/b6a00572c63fc77337390c29861cdd9f/raw/2f07afdc0b1334f3501015730799422daaea6efa/latest.txt

Collapsing to new master ticket: #762

Also, you have IC2 in there, which is known to have this incompat issue as shown in the above new master ticket.

You also have Sponge, which DEFINITELY has conflicting issues with AS. Remove those two and run a test launch and see if it still tosses the error. If it does, something else in your list is also triggering this and will need to be investigated.