SRD
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The idea is that we have skills (for example, a rune shield) that grant a spell. This allows the spell to be, in a way, contained within the skill. I don't know the exact mechanism, but the goal is that because some skills are only given to specific factions, the spells they grant will also only be available to those factions. Furthermore, we need to experiment with customization – for example, a dragon summoning spell can be based on the phoenix summoning spell. I've seen how the avatar of death was reworked in one mod – feel free to suggest your ideas.