These "Overlord" type RPs are usually some of my favorites in the old Guild.
I have quite a few ideas, like reincarnating an older monster that had extensive "True Animation" magic to amass armies of golems, poltergeists, living armor, and all sorts of living, inorganic things. Ah, it was so fun to turn practically everything into a minion~

There's also that time where I played as something akin to a "God of Decay," where they and their minions weren't very strong themselves, but their land and surroundings weakened, decayed even, their intruders dramatically. Lots of tactical play for them, keeping their "territory" mobile so that they wouldn't get picked off themselves. They were quite fun!

And the one time I used that crystalline blight! Monsters of transparent and hard material who, despite being weak alone, had an obscene amount of numbers to make up for it.

Choices, choices~
Ah, but I should not get ahead of myself. I'll keep watch on this definitely, but I may not be able to join in immediately.