Light, like any other magic, is always useful. But for an Elf, learning 2 magic skills is too much. If you're going to develop him, it's better not to focus on Chaos (in my opinion). As for Chaos, I prefer to develop Empathy, Readiness (defense + attack), Luck, and Magic Affinity. Without Magic Affinity, even an Elf might run out of mana with Empathy. Instead of Readiness, you can choose Mechanics or Logistics.
Light, like any other magic, is always useful. But for an Elf, learning 2 magic skills is too much. If you're going to develop him, it's better not to focus on Chaos (in my opinion). As for Chaos, I prefer to develop Empathy, Readiness (defense + attack), Luck, and Magic Affinity. Without Magic Affinity, even an Elf might run out of mana with Empathy. Instead of Readiness, you can choose Mechanics or Logistics.