The later you start using BEXP, the better. IMO, the best time to start using BEXP is after a character caps a few of their primary stats (ie. Haar caps Strength and HP), since you always gain 3 stat points per BEXP level. You can promote your chars with BEXP, though I wouldn't recommend it since it's a waste of points.
@Gamerace
Micaiah is usually strong enough to knock out cavaliers and armor knights with a single it (using Thani), so it's always good if she can get some kills in. After she becomes a sage, you can give her the Paragon skill and staff abuse her to lvl 20 in a relatively short time.
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