Posted 16 August 2012 - 04:39 PM
Class level = Displayed level (+20 if promoted, +0 if not)
When a character uses a Change Seal, the game saves half their class levels as internal levels, which then get added to their class levels when determining Exp gain. So:
10 Lord --> 1 Cavalier = LV6
20 Lord --> 1 Cavalier = LV11
10 Lord --> 1 Great Lord = LV21
20 Lord --> 1 Great Lord = LV21
Internal levels are cumulative from all times using a Change Seal, as well as the DLC class items; they work the same way - up to a point. The game only saves a certain number of internal levels per character depending on the mode.
So on Normal, no matter how many times you reclass Krom, when he's a LV1 Great Lord, he'll gain Exp as at most a LV41 unit, which isn't great, but it's reasonable with the sorts of enemies he can take on. On Lunatic, however, if you've reclassed him enough, his Exp gains can slow to the pitifully slow rate of a LV71 character even as a LV1 Great Lord, and they'll just get slower as he progresses in the class. Fortunately, there's a minimum of 8 Exp per kill, and characters in this situation will make full use of it.
It's worth noting that enemies can have internal levels as well, but I don't know how much or when.