[@Zyx]
Enslaving the gods, eh? I look forward to seeing how he pulls that off. I imagine some contract shenanigans would be involved, like some expertly worded fine print that backfires on the patron at some point. If you can get your hands on a Bane weapon, it may be possible to kill the patrons outright. True Bane weapons are blessed by the gods, like actual highest-level gods (i.e. beyond demigods), to condemn to the afterlife whoever receives of them a mortal wound, regardless of any other mortality considerations. So if you were to smite a demigod's avatar with it, their soul would immediately lose all its authority and gravitate to the afterlife, even if that individual would normally have the Divine Authority to live beyond death. Bane weapons are really only effective against higher beings, since mortals are already dragged to the afterlife upon death, so a Bane weapon wouldn't affect them any differently.

True Bane/Godbane weapons capable of indiscriminate slaughter of demigods are little more than a myth right now. However, Regret was able to create Demibane weapons from her own lifeblood capable of canceling the inherited immortality powers of her contractors. They only work on those empowered by Regret (though not on Regret herself). They're mandatory for killing Yddrog again, so the players will eventually get their hands on these. There's also a lesser version, Rot weapons, that cancel all cell division in the injured area and poison the target's body with enchanted Blood of Regret. Normally her blood would grant immortality to whoever it flows through, but she can flip its effect with an enchantment to sap life instead. The target will visibly age and rot away as the poison makes its way through their body. So anyone with unascended/biological forms of immortality, like vampires or zombies, will rapidly fall to this weapon.

Yddrog has his own equivalent, Dragonbane weapons, that can pierce any inheritor of Yddrog's blood by "commanding" it on contact to make way for the king. Take a wild guess who it's meant for! e_e