Hey! Sorry for my confusion, but I'm not sure what you mean when you say that all NPC/monsters have modifiers, if you check their attacks they don't show any modifiers. I'm probably missing something, so please clarify.
you are correct, a monster's CON modifier is not added to their total HP, you just roll it and that's it.
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In previous edition NPC/Monsters stat block didn't have any statistics. In Branded Edition they have statistics like PC. For example Black Bear has STR 19 ( 3) so that is why my confusion. Does it has Attack bonus from HD ( 4) or from Strength ( 3) and for damage ( 3)?
Question with Con modifier to HP: what about PC?
Ahh, sorry, now I understand! Those Ability modifiers are there just in case you need them for other stuff, you can safely ignore them and just use the HD as modifier.
As a player you do indeed add the CON modifier to your HP total, but only once, not once per level like in 5e. I just realized that this is not explained in the book, so I'll fix it. Thank you so much for the feedback!