Use this Dark Mage guide to compare base and evolved forms, identify the relevant build questions, and confirm live requirements before spending resources.

Guide overview
Keep the two forms separate
The earlier reference earlier has separate Dark Mage and Dark Mage (Sovereign) pages. Do not plan an evolution or equipment build until you confirm which form the guide is describing and which form is available on your account.
The earlier material presents the Sovereign form as a dual-element magical unit. That is a useful team-building signal: inspect the current enemy resistance and your support coverage rather than judging it by rarity alone.