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While cooking a bit with the help of my Spirits, I looked at my Status through the phone App for BNLO, and there I found the list of Skills. I rechecked the Blacksmith Skills I had. If I remember correctly it's also possible to unleash the effects of skills to an extent even without making them soul bound, as long as I have enough Mana and the connection to use them.
And the connection right now is Ignis! Now that I've summoned him, it should be possible to use these Skills abilities and Techniques more freely without having to put a lot of effort into it, a single spell connected me to the whole blacksmith path!
Now let's see… Been a while since I checked them, and they have all leveled up after all.
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[Hephaestus' Blacksmithing: Lv8/10]
A Unique Skill that cannot Level Up through Skill Points and will only Level Up through constant practice and improvement of the Hephaestus Descendant Subclass.