User blog comment:BannedLagiacrus/Monster Appreciation Week: Nightshade Paolumu/@comment-26826688-20200127230458/@comment-31134689-20200129031150

The guideline I use to determine monster's HP in-game is to use boulder and clutch claw wall damage. Boulder deals 10% of monster's HP and 5% for wall,iirc. It's simple math after that.