This one is probably the biggest mystery to most when they hear it for the first time, but it makes sense. Just like Strength gives you more Carry Weight and Melee Damage, Endurance gives you health, did you know that Intelligence gives you more XP the higher it is?
Honestly, to work out the numbers ALL over again with the recent addition of One Wasteland (and XP changes entirely), it wouldn’t be worth it to know how much exactly each enemy gives BUT let me tell you that it’s absolutely worth it.
For every point you put into intelligence, for every piece of armor or weaponry you use with +1 Intelligence, food or drink with bonus Intelligence, ANYTHING to boost Intelligence is the key. With every bit, you will gain slightly more XP, and can easily gain 2 or 3 times as much XP than usual with just a couple boosts to INT.
So, when you find gear with Intelligence boosts, don’t always toss it away, most players have full sets dedicated to grinding with those builds!