In FoV you can keep enemies respawning if you delay solving the associated quest. I got to level 47 near the very end of the game, with a minimal amount of re-clearing a couple of the caves in Aleroth (I did delay turning quests in as long as possible throughout the game, equipped stuff with Wisdom bonuses before turning in quests, and explored the fjords before going to Sentinel Island to get more experience from the first mindread you can do there).
I got level 9 and 10 formula for everything, but only used a couple level 10 Healing Auras (unnecessarily hoarding malachite gems), sticking to level 9 for the rest.
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