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The Familiar Soul Feasting Skill was quite interesting, it seemed to be similar to the Familiar Buff Card Skill at surface value but seemed more complicated and a bit different as well. First of all, when I eat a Familiar Soul, I restore Mana, almost 50% of the Mana used to create the Familiar Summon.
Second, when I eat the Familiar Soul, I temporarily gain their traits, but in a phantasmal appearance and form, I gained the wings of this bird familiar, which popped as ghostly wings. It seemed I could unleash the feather projectiles with them, but they were now different, transformed into phantasmal feathers instead.
It seems to be limited to one ability, but as I tried with more Familiars, I discovered I could stack the souls up to ten times. Much more than the Familiar Buff Card.
And about Stats? I gained a percentage of the Familiar Stats instead of a flat buff, pretty interesting.