Leveling up to level 4 requires the following:
- Hero status as determined by a God, demi-god, arch demon, or other non-labeled divine beings with the power to do so.
- 1000 silver pieces of the local currency
- A combined total of 8000 XP and AP
- An orb for direct communication and someone with Godsight, which Ashley has because she rolled a 20 and I had to give it to her even though I didn't want to, I'm not kidding she asked for it and I told her she could have it only if she rolled a 20, or pre-ordained totem or token given by a divine being as a blank check.
Mixed currency will not work.
Silver in bulk will not work.
Or, those who train for years and have not attained the Hero status may still technically attain level 4 but will not gain any more experience, such as the guards in Neverwinter. Unless one of then is in fact a hero, all of them are always level 4, it is the highest level that can be attained without divine intervention. Still they have to pay 1000sp just in case they do ever become hero status.
Additional information that Alice doesn't care about:
To be eligible to marry a Princess or Queen, you must either have royal bloodline or hero status, again, hero status is only given by divine will, in the case of hero status, you will be given the title Prince Consort, advance to Duke, or be the Queen's consort given the marriage is to a reigning Queen.