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From The PSUPedia
This status effect boosts the ATP stat (physical attack power). The Fire TECHNIC Shifta and the boost item Agtaride can both cause this effect. It can be overriden if the target has the Lower ATP status inflicted upon them.
Certain monsters (including Vahra) 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
Agtaride bestows a LV 2 effect on the player.