ps la formula del waterball es esta Hits the target up to LV*LV-1 times with a Water elemental attack (100+30*SkillLV% MATK). You must stand on water or on a Deluge (Sage skill) cell to successfully use this spell. The damage for each hit is calculated individually and the damage numbers do not show as adding up, also casting Lex Aeterna (Priest Skill) on the target will only affect the first hit. This is the strongest single target spell in-game. The number of water balls that you are actually able cast also depends on the amount of water you are standing in. In any given X by X grid, the game determines that you are surrounded by (X*X)-1 cells. So, at level 4/5 Waterball, you can cast up to (5*5)-1, or 24 water balls. However, if you're only standing in a 3x3 pool, you will only cast 8 water balls. If you're standing in a freaky grid (like a partially-used Deluge), the number of balls cast is equal to the number of water-occupied cells in your grid.
basandonos en eso seria algo asi (10*10)-1 para un total de 99 bolas de agua alas cuales creo q el problema es conseguir suficiente agua por medio de los tapetes a menos q se coloquen varios juntos ps no se creo q es bastante dificil conseguir la cantidad de agua requerida