I was playing a modpack I'm developing (link below) and Blood Arsenal keeps causing it to crash during the fourth loading phase. This is also replicable if you go into twitch through a custom profile, adding only Blood Magic and Blood Arsenal, the same thing happens. The crash log from when I tried to load it in my custom pack is also below.
JahYi's All Magic Pack-0.1.zip
crash-2018-08-15_10.35.20-client.txt

Update BloodArsenal to 1.12.2-2.1.0-24.