I'm currently trying to add a Favored Class Option for a Lesser Derro Alchemist (KP Advanced Races Compendium) to add +10 minutes to mutagen duration. There is an identical ability for Drow in the Advanced Race guide, so I am using that as my model.
And, well, it just doesn't give me the selectable option for said Lesser Derro. I'm guessing that I'm missing something obvious. Any ideas
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