Item Seed: Spell Cubes. – Moe Lane
White: Heal To activate, touch the center square on one side, concentrate, and spell whatever magic energy is required. The basic spells do not need to have the Spell Cube in a pattern to work, but they also have very mild effects, and the amount of energy that can be put into one is limited. Creating a pattern with a Spell Cube can produce more blended (and powerful) effects (for example, combining Heat/Deflect to make a fiery shield), but the process is not instantaneous. At a minimum, the caster will have to make both magical skill rolls to define the effect, and a physical dexterity check...
Source: moelane.com