At a first glance: this document is quite easily readable (not that that’s a factor for judging), though I feel the “The Jester of Doom” text gets a little bit lost with the backing illustration. I also quite like the typeface choice - it’s fun and whimsical, and fits the vibe you’re going for!
I quite like ‘Captivated’ as a condition. It immediately reads to me as the opposite of ‘Frightened’ - which I was pleased to see was functionally its mechanics; and generally something I can see working quite well with the existing hame design. It feels like a *natural* inclusion.
From a lore perspective: I’m curious about the Onyx Realm. Is this perhaps the manifold Cthrion Uroniziir originates from, or one of their own making? I only ask because we know from MCDM’s lore discussions (and confirmed in the ‘Crack the Sun’ backerkit) that Cthrion is currently imprisoned within the sun of Orden.
I was a bit skeptical about having the Herald’s two statblocks layered over one another - but that was a good call for concision, and you made it really clear which abilities came online and when. It reads very clearly, and I would not foresee myself getting confused/frustrated running the encounters.
I do wish there was more variance in the ‘Leader’ abilities for when the Herald becomes a ‘Solo’ monster - the current design is condition-adds and a damage-add; maybe a slightly modified range, or being able to target an additional creature with ‘Dance, Dance, Dance Mad!’ would help further the distinct feeling between the two phases (or maybe it would break game balance - I haven’t tested it; I’m just spitballing ideas).
Overall, this is a solid entry! Nice work!