About Eschalon: Book I

2: 1k total XP
3: 2k (+1k XP)
4: 3.5k (+1.5k)
5: 5k (+1.5k)
6: 7k (+2k)
7: 11k (+4k)
8: 15k (+4k)
9: 20k (+5k)
10: 30k (+10k)
Any subsequent levels take 10k XP (verified up to lvl 17)