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Once the Link Skills are chosen, I cannot change them back, so I've gotta be a bit careful about what I choose. I already tried taking the strongest Skills they had, such as both of their Physique Skills and other unique ones, but they were impossible to Link.
So, I went for the second bests of them, and these ones ended working, now, I had ten new Skills just like that. It sucks that I cannot level them up myself, as their levels depend in the Spirit Skill Level, but it still rather good.
[You have created a Spirit Link with Woo]!]
[You've Linked with the [Meteor Fist: Lv7] [Lightning Blood Fist Arts: Lv5] [Awakened Strength: Lv6] [Paralyzing Strike: Lv5] [Blood Electrification: Lv5] Skills!]
[You have created a Spirit Link with Fang]!]
[You've Linked with the [Wolf Beast King's Aura: Lv6] [Pack Leader's Commands: Lv6] [Blood Werewolf's Scarlet Claws: Lv6] [Blood Werewolf's Wrathful Fangs: Lv6] [Blood Frost: Lv5] Skills!]