This is great feedback. Thank you so much. I agree that S4vant may be doing too much work. I originally had a Warden note that his lines can be given to any other characters, but I decided to cut it for space. Sounds like I should re-add it.
Interesting point about the health. In my playtest, players killed the Bulgasari after it ate the lava tube door away, but killing it caused a reset, putting the door back, so maybe I shouldn't have reality reset if a myth is destroyed. Or I could just simplify it, get rid of stats, and make it clear to players that they're not going to kill any of them.
The myths do take up too much space! This is honestly due to d10s being the standard die lol. I really didn't want to remove the flavor text for the myths, but maybe that is necessary to free up some space for the actual adventure.
Thank you for taking the time and providing thoughtful criticism!