Chests floating out of reach can be brought to the ground with Gravity/Gravira/Graviga magic. Chests beyond reach near the bubbles are slightly more tricky. Bubbles are air in water. Water (HOH) forms a crystaline solid at temperatures below 32 degrees Farenheit, 0 degrees Celsius, or 273 Kelvin. In other words, freeze the frelling bubble. It forms a platform you can stand on. But it only lasts for a short time, for the solidified water will melt eventually...