AP doesn't decrease when it rains.
All AP +X
All Accuracy +X
All Special Attack Extra Damage +X%
Attack Speed +X
Casting Speed +X
Critical Hit +X
Extra AP Against Demihumans +X
Extra AP Against Humans +X
Extra AP Against Monsters +X
Extra AP Against Monsters Up (from PRI)
Hunting Damage +X
Increase All AP
Increase All Accuracy
Increase Extra AP Against Monsters
Max Stamina +X
Medium/Large Siege Tower, Cannon, and Annex for Node/Conquest War Extra Damage (Excluding Hwacha, Flame Tower) +X
Movement Speed -X%
Savage Rift Damage +X
Y% chance to recover X HP on hits
Extra AP Against All Species +X (Except Humans)
Extra AP Against All Species Up (Except Humans)
Extra AP Against Demihumans Up