Useful Skills
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There was the Class Skills, which were divided into the offensive ones, some of which ended merging with already existing attack skills, and then there were the Subclass Skills, mostly used for Support, Enhancement, or Crafting.
The Skills that I recently had from the Classes, which had not been absorbed or fused with other Skills were Berserk Mode, Apprentice Blacksmith Recipe Book, Rune Smithing, Soul Binding Alchemy, and Shadow Sculping Arts.
I have used the Soul Binding Alchemy to create Fabian friend's new bodies to an extent, so I know of the Skill's abilities a bit, but what about rest? Not at all, and I plan on using them to make some new equipment or reinforce existing ones.