Gaining HP per level depends upon sublevels

[_0AfTeRsHoCk0_]

After numerous restarts, I've confirmed this idea.

Say you're a warrior who has no mental skill he can gain experience on, and all you do is level up using physical exp. Chances are, despite your constitution, you'll gain about 8-10 HP per level. However, if you have a nifty mental exp you can gain experience on, such as woodlore, or writing, and you use it in moderation with another skill such as physique, then you can gain a lot more HP like 10-13.

So try and level up on a 1:1 ratio with your other skill for the first few levels if you want lots of HP