Boris K
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I agree that Chaos magic won't hinder the Necropolis faction. However, I don't think it's worth taking up two skill slots with powerful spells. If you choose Chaos, you shouldn't invest in summoning (in my opinion). Similarly, I never develop both Light and Darkness simultaneously.
For Dark factions, I only develop Chaos. For other magical races, I develop either Darkness or Light, and one of the powerful spells. However, for a Mage, you can skip developing magic altogether and focus on Attack skill. But this is risky.
For non-magical races, I develop either Darkness or Light. But even here, there's an exception – for Light factions, developing Chaos can be very tempting.
For Dark factions, I only develop Chaos. For other magical races, I develop either Darkness or Light, and one of the powerful spells. However, for a Mage, you can skip developing magic altogether and focus on Attack skill. But this is risky.
For non-magical races, I develop either Darkness or Light. But even here, there's an exception – for Light factions, developing Chaos can be very tempting.