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I found it in the guild in the 2nd mission, but I didn't take it. I need it for the 3rd mission.
In my opinion, a chaos knight like Railag doesn't need a second spell. By the time you summon a phoenix and it enters the battle, the enemy will hit you with a chaos spell, or even twice. I think it's better to focus on melee damage or shield skills and upgrade something else instead of the second spell.