In season 4, Project Diablo 2 introduced a new boss - Rathma. And before releasing the ingredients for the fight, they posted this short verse:

The Ode of Rathma

Hidden from the brightest flame,
The dead remain to speak His name.
Rob the shadow to splinter His light,
turn your soul evil and conquer the night.

Then it turned out that:
"the brightest flame" meant Hellfire Torch
"The dead remain to speak His name" meant Trang-Oul's Jawbone that drops only from undead monsters
"Rob the shadow to splinter His light" meant Splinter of the Void that drops from a certain map event
And 4th line probably refers to the nature of Rathma, he's an evil necromancer. 

Now, in season 10, they're introducing another boss, that we don't know the name of yet. But we know that it's a powerful demon or a fallen angel from Diablo lore, who hasn't been featured in other Diablo games, possibly Lucion, so just keep that identity in mind. The boss might use curses and lightning spells, but it might also not.
We don't know what the ingredients will be, but the speculation so far is:
Annihilus or Annihilus ash (1) + some ingredient that only drops from demons (2) + some shard that drops from a Dark Wanderer map event that summons a random Prime Evil that drops Worldstone Shards, which is prephrased with "Darkness itself wanders these lands..." (3)
The 2nd ingredient should not be an actual item from the game, but some miscellaneous item, like an organ or a piece of a demon's body or an essence. All demons would be able to drop it, so don't make it too specific like a feather, not all demons are birds, for example.

What I want from you is to come up with the names of the 2nd and 3rd ingredients and write a verse similar to above for each ingredient set. Make it like 5 possible ingredient sets / verses.

The ingredients and the boss name should not be explicitly mentioned in the verses. Don't mention demons explicitly either. If you don't know what Annihilus is and how to incorporate it into the verses, this might help you:
"The Annihilus is a unique Charm dropped by Uber Diablo.
This item uses the sprite for Mephisto's Soulstone, despite a sprite for a red-colored "Diablo's Soulstone" having existed in the game at the time of creation which could have given it a more unique appearance.
It's like a blue shard. But it can also be red when corrupted. And you can break it into ash."

First 3 lines of each verse should represent each ingredient, and the 4th one is thematic, basically like in The Ode of Rathma.

These ingredients already exist in the game, you can follow the theme, but obviously don't reuse them: Prime Evil Soul, Black Soulstone, Pure Demonic Essence, Splinter of the Void, Trang-Oul's Jawbone, Hellfire Ashes or Hellfire Torch.
Also, there already are Brain, Horn, and Eye, don't use them.

--

I also asked another AI assistant to do the same and here are its verses. Go through all of them, yours and its, rank them and pick the best ones. Maybe you can even improve some of them.

Set 1
    Second Ingredient: Essence of Suffering
    Third Ingredient: Shard of Nightfall

Verse:
In the fading glow where daylight dies,
Gather essence from tortured cries.
Seek the shard from night's deep thrall,
Unleash the one who shadows all.

Set 2
    Second Ingredient: Demonic Heart
    Third Ingredient: Shadow of the Wanderer

Verse:
Where the ashes of oblivion lie,
Claim the heart where spirits die.
From shadows cast by a wanderer's stride,
Unleash the power that darkness hides.

Set 3
    Second Ingredient: Demonic Blood
    Third Ingredient: Echo of the Void

Verse:
In rivers where corruption flows,
Take the blood where darkness grows.
Heed the echo from the void,
Summon the force that time destroyed.

Set 4
    Second Ingredient: Essence of Malevolence
    Third Ingredient: Whisper of Shadows

Verse:
Beneath the veil where daylight fades,
Seek the essence where malice pervades.
Hear the whisper from shadows deep,
Awaken the one who rises from sleep.

Set 5
    Second Ingredient: Infernal Core
    Third Ingredient: Shard of Darkness

Verse:
From fiery depths where evil hides,
Claim the core that inferno provides.
Find the shard that shadows guard,
Release the power once kept barred.