I tried 4 times, but there was no reward for destroying the demon legion.
Oh, yes, there's a problem there. Because there is no main boss, it would be too much if every demon dropped, so I disabled it. I need to fix this. Maybe just make one of the demons drop rewards.
The reward for hide-and-seek is only 2 blood runes, is that too few?
This is correct. Hide and seek is much easier than Vampire Hunter NPC quest which gives you 3.
Is it a bug? Start at 57:16
She just died when you entered the room? It's a bug for sure, I need to find the reason. Thanks.
EDIT: I found it. The max HP possible was 16000, so if boss had more HP it would wrap around to negative numbers. I will fix this in version 5.0.6. later today.
BTW, I love how you replaced the music files with the one from Monster Boy and it switched automatically in the boss fight