Ignis (Orange): Shoots a fireball. Umbra (Purple): Makes you temporarily invisible. Aqua (Blue): Shoots a burst of three waterballs. Mortem (Dark Gray): Shoots a damaging pulse in both directions. Terra (Green): Shoots an earthball which is affected by gravity. Lux (Pale Yellow): Shoots a beam of light. Aer (Yellow): Launches a wall of air. Vitae (Red): Briefly heals you. Fulmen (Light Grey): Shoots lightning. Tempus (Turquoise): Summons a time vortex. Immunis (Magenta): Gives you a temporary shield.
These symbols really just came to me out of nowhere, and I was inspired to make this project. I might eventually make a full game using them. They're vaguely based on Norse runes.