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From The PSUPedia
This status effect boosts the DFP stat (phsyical defense). The Ice TECHNIC Deband and the boost item Defbaride can both cause this effect. It can be overriden if the target has the Lower DFP status inflicted upon them.
Certain monsters (including Polty) 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
Defbaride bestows a LV 2 effect on the player.