honest cedar
@registerModifier()
class modifier_face_of_cleric extends BaseModifier {
DeclareFunctions(): ModifierFunction[] { return [ModifierFunction.EXTRA_HEALTH_BONUS]; }
GetModifierExtraHealthBonus(): number { return 500; }
}
The book of the dead units get 1000 extra health instead of 500...
dusky monolith
If you read description you will find that book of the dead units have 100% bonus max hp:
Summons 4 level 3 Necronomicon Units that last 75 seconds. Units have 100% more health and 75% more damage.
and considering fact that there are barely any max hp bonus buffs in game i guess valve decide hardcode that any extra_health modifier properties x2 for them
P.S. This can be true ofc only if you are 100% sure that there are nothing else mess their max hp