The Sword of [[Zariel]]. Contains a [literal spark of goodness](https://thealexandrian.net/?p=45372): Zariel placed a shard of her own soul in the Sword deliberately, knowing that the devils were coming for her and sensing her own weakness.
[RA 6b](https://thealexandrian.net/wordpress/45005/roleplaying-games/remixing-avernus-part-6b-the-avernian-quest):
> Note that I’m deliberately getting rid of the option of shattering the Companion by hitting it with the Sword of Zariel. Because the Sword can also sever the chains, my personal preference is for it not to be a one-stop shop for solving the whole problem. Your mileage may vary, however, and there’s nothing inherently wrong with a Sword-wielding PC swooping up and hacking the planetar out of its prison.
> (...)
> **THE SPARK IN THE SWORD**: The Sword of Zariel contains a spark of Zariel’s divine light (and could be used to redeem her). This is not a proper revelation, but it is a significant info-dump so it may be worth pointing out here.
>
>- **Lulu’s Memories**. Foreshadow the truth.
>- **Claiming the Sword**. The moment of claiming the Sword makes it crystal clear that the spark exists (and why it exists). See [_Part 6D_](https://thealexandrian.net/wordpress/45883/roleplaying-games/remixing-avernus-part-6d-j-lulus-memories-claiming-the-sword)_._