Sleth gets in on the roaring action, bellowing her challenge to the sun's idol. Her wings fold, and she dives down, her Holy Avenger preparing to pierce the godling's stony flesh.

Spoiler: OOC
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Activating Rage as a Bonus Action. Not relevant at the moment, but can I use one BA to Rage, and a second on Cunning Action with my boon?
Or if I take two Bonus Actions, they BOTH have to be Cunning Actions?

Anyway, on to rolls.

(1d20+16)[30] Attack
(1d20+16)[22] Advantage from Reckless Attack, no penalty due to Elusive
(1d8+12)[16] Magical Piercing damage with Rage Bonus
(9d6)[42] Sneak Attack
(2d10)[12] Radiant if it counts as undead or fiend, which I don't THINK it does, but I'll roll it anyway