The Arena manual says that Endurance has an effect on your hit points, fatigue and hp regeneration when resting. It's the first point I'm asking about here. Do they mean Endurance works like it does in Oblivion, where your Endurance score adds a percentage of it to your HP gain on levelup, and thus, is not retroactive? I ask because in every RPG I play, I try to optimize my levelling, and if maxing Endurance ASAP is the only way to do this, I will. Int gain is linear, and I can level it any time I want and always get the same MP, but the Elder Scrolls games have always made HP trickier to accumulate. Thanks for the clarification. I checked numerous sites on the internet, only to find their facts were largely cut and pastes of the manual. That HP gain is already random as is, Xbase +1dY start and 1dY per level, it's harder to pinpoint the effect Endurance has on levelup.

It works similarily to Oblivion, yes.

The Arena manual says that Endurance has an effect on your hit points, fatigue and hp regeneration when resting. It's the first point I'm asking about here.

If you check your character sheet (by pressing the F1 key), you will see your current Endurance score. Next to it is a modifier called Health. This modifier is your HP leveling bonus. If you are, say, a Spellsword, if your Endurance is at 50, Health will be at 0, so when you level you will get 1 to 12 HP. If your Endurance is 100, Health will be at +5, so when you level you will get 6 to 17 HP.

Read between my lines for an extra hint how to maximize HP.