This Seeking Tech guide will show you the fastest way to level up in Jeanne d’Arc.
After Stage 12
After completing the 12th stage of the campaign, make sure you have the Cyclone II spell. If you don’t, then you can farm them from Ghosts in Bastille of the Augustins.
You should then head over to the Altois Prairie. The Dragons here starts out at level 30. If you are able to hit these enemies for all nine tiles with Cyclone II, then you should be able to get a lot of experience points.
If you beat Altois Prairie for the first time, then there will be three level 50 Dragons in subsequent visits.
After Stage 25
After you beat the 25th stage of the campaign, you should gain access to the Langles Tunnel. After beating this optional location for the first time, there will be two Level 40 dragons in subsequent visits. This is the best place to level up in the main game due to the close proximity of these enemies.
Post Game
After you beat the game, you can use Tiamat in Voldor Temple to level up. This enemy starts out at level 70 on your first visit. If you beat him, then he will be level 80 in subsequent encounters.