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From The PSUPedia
Certain monsters (including Jarba) have the ability to cast this upon themselves.
LV 1: 11% boost for 2 minutes
LV 2: 15% boost for 3 minutes
LV 3: 19% boost for 4 minutes
LV 4: 23% boost for 5 minutes
LV 5: 27% boost for 6 minutes
Retaride bestows a LV 2 effect on the player.