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Usually, I take:
1) Gate Opening (it's generally essential for them, but I would still take this skill).
2) Mechanics, and I develop a ballista there.
3) Luck, it's very useful.
4) Leadership.
5) Logistics.
6) Chaos Magic, it's needed by demons. That's all, and by the way, I advise choosing these skills specifically for demons because they are really useful and have helped me countless times.
1) Gate Opening (it's generally essential for them, but I would still take this skill).
2) Mechanics, and I develop a ballista there.
3) Luck, it's very useful.
4) Leadership.
5) Logistics.
6) Chaos Magic, it's needed by demons. That's all, and by the way, I advise choosing these skills specifically for demons because they are really useful and have helped me countless times.