java.lang.NullPointerException: Cannot invoke "net.minecraft.world.damagesource.DamageSource.m_7639_()" because the return value of "net.minecraftforge.event.entity.living.LootingLevelEvent.getDamageSource()" is null
at TRANSFORMER/[email protected]/com.hollingsworth.arsnouveau.common.entity.familiar.FamiliarDrygmy.onLootingEvent(FamiliarDrygmy.java:34)
at TRANSFORMER/[email protected]/com.hollingsworth.arsnouveau.common.event.FamiliarEvents.fortuneEvent(FamiliarEvents.java:78)
at net.minecraftforge.eventbus.ASMEventHandler_507_FamiliarEvents_fortuneEvent_LootingLevelEvent.invoke(.dynamic)

You are on an old version of the mod, update to the latest.