This change is 

can we do this as battle_config ?
or else members will start complaining suddenly seeing a feature they used to and suddenly it disappear

also, MD_BOSS also included mini-bosses like Angeling, Mastering, Chimera, Bloody Knight, etc...
make sure you check

@AnnieRuru sure. Yeah, mini boss also don't have hp bars. even emperiums and barricades

how about emperium?

@tlacson7 even emperiums doesn't have hp bar. only normal monsters.

that's why I also felt like rathena did the wrong way
they use hidemobhpbar mapflag

I think the correct way is just hiding the specific ID of monsters...
can you confirm WoE guardian also has hp bar ?

then probably add flag into mob_db to show/hide hp bar?

actually we need to be able to set a monster class from the db as in aegis they have 4 classes CLASS_Normal, CLASS_MVP, CLASS_Boss, CLASS_Guardian the hp bar show only for CLASS_Normal also there is a script command to force showing it showmobhp.. this is to be used with other things as well such as the class icon near the name for mobs/pets....