Demon Lord Aspects

[Devcon1]

Hello all.

I am currently running an adventure for a party of 6 10th level characters, and the next major encounter I'm planning on unleashing upon them is a fight against 5 demon lord aspects: one of Zuggtmoy, one of Jubilex, one of Shublox (a homebrew demon lord of slime and famine), Quorgeth (for those who don't have the Tome of Beasts, he's a demon lord of worms and decay) and Yibyiru (a demon lord of slime, fungi, poison and corruption that's mother to all 4).

Rather than try to make a from-scratch homebrewed creature for all 5, I was planning on using (or slightly altering) different creatures to use as minor aspects of them. However, I'm not sure what to use. As such, I come to ask for your opinion. What creatures would be best used to represent them?

[Unoriginal]

Why not take the Demon Lords' statblocks and diminish their stats accordingly?

Less HP, smaller stat scores, smaller proficiency bonus, less damages for their special powers, no lair action, etc.

[Devcon1]

Why not take the Demon Lords' statblocks and diminish their stats accordingly?

Less HP, smaller stat scores, smaller proficiency bonus, less damages for their special powers, no lair action, etc.

I might just do that with Jubilex, Zuggtmoy and Quorgeth, but I lack a statblock for Yibyiru and Shublox (as they are homebrew), so I still need something for them.

[Cespenar]

Many of them sound very similar to each other. A Vine Lord for Zuggtmoy, Corrupting Ooze for Jubilex/Shublox/Yibyiru, maybe a Purple Worm for Quorgeth (the CR is too high but they are very weak to magical attacks). I don't know how you can differ at least three ooze/slime themed aspects, though.

[Devcon1]

Many of them sound very similar to each other. A Vine Lord for Zuggtmoy, Corrupting Ooze for Jubilex/Shublox/Yibyiru, maybe a Purple Worm for Quorgeth (the CR is too high but they are very weak to magical attacks). I don't know how you can differ at least three ooze/slime themed aspects, though.

Vine lord was my first choice for Zuggtmoy, I was just wondering if anyone else had other suggestions. Corrupting ooze works for Jubilex/Shublox, though I was hoping for a cross of slime and fungi for Yibyiru (weeping treant, perhaps?). As for Quorgeth, a purple worm might work, though I was also thinking of perhaps using an altered young/adult remorhaz, changing its fire damage to necrotic to symbolize Quorgeth's decay.

[Socratov]

You know, power corrupts and absolute power corrupts absolutely. Why not have the aspects be sentient and sapient creatures that have been infected with, or accepted the power of such a demon lord?

Just take an NPC statblock and give one ability score to excel at (18 or 19, like the effects of a headband of intellect or something) and a signature move connected to the demon lord or his realm. (his portfolio if you would). Finally you add a signature defence (thus completing the innate power|defensive power|offensive power triad)

And let's call this a template: something to tack on to other creatures and adversaries while the party rises to end the demon lord.