One of the things I really liked about this expansion is that the anemic level 10 cap was doubled... now we can go up to level 20! But now that I am around level 9 in my party, I'm starting to wonder if the next ten levels will do much good. If memory serves, there's a point in D&D where you dont get any more hitpoints, other than 1 or 2 per level. And I couldn't help but notice that all the level perks in my classes seem to stop at level 10. So even though I can now go up levels 11-20, does it even get me anything if I am putting it all into one class? Of course the option remains to multiclass. But from what I'm reading around, you get big penalties unless the classes are within one level of each other. With my guy around level 9, it occurred to me that I'm going to have to max out all the XP the game has to offer (with lots of grinding) before that's even close to feasible at this point. Furthermore, do all the multiclass abilities work harmoniously? Waaay back in second edition, if you changed your class, you couldnt use the abilities of your old class (at least not without a massive XP hit) until the new class surpassed it. Plus the equipment limitations always applied... that is, if you were a level 5 mage who switched to fighter, then grinded up to fighter 6, you still were not allowed to cast while wearing armor. Or do you simply get the benefits of all classes at your disposal when you are multiclassing? I assume you use the more favorable combat to-hit rolls? ie a 3rd level fighter that switched from a 5th level cleric would get the fighter to-hit?
In AD&D 2e, your HP maxed when your HD did at level 9 or 10. In D&D 3.x and beyond, people realized that was stupid and gave people 1 HD per level with the associated HP.
They now use a basic attack bonus instead of thaco. so a 5th level cleric who switched to fighter and became level 3 would have the attack bonus of a level 5 cleric PLUS the bonus for a level 3 figter ie. +7/+2 foe 2 attacks. You now have a favored class and as long as that is 1 of 2 classes no problem, otherwise to take an experience earned penalty. A for armor, you need proficiency and armor now has an arcane caster penalty witch can cause spell failure.