Can you use a Boon of Erebos on a creature that's affected by the ability of Furnace Brood?
Can you use a Boon of Erebos on a creature that's affected by the ability of Furnace Brood?
Yes, that's fine. Since the creature can't be regenerated, you simply ignore the portion of the Boon's effect that tries to regenerate it. The rest of Boon of Erebos will resolve properly.